Complex sentences are essential tools in the English language, allowing for the expression of intricate ideas and relationships between them. They combine an independent clause, which can stand alone as a sentence, with one or more dependent clauses, which cannot. These dependent clauses often begin with subordinating conjunctions such as because, although, if, when, and while or relative pronouns like who, which, and that. Understanding how to construct and use complex sentences, including those starting with “because I said so,” “although it was raining,” or “if you study hard,” enhances clarity and sophistication in both writing and speech. Anyone aiming to improve their communication skills, from students to professionals, will benefit from mastering complex sentences.
Table of Contents
- Definition of a Complex Sentence
- Structural Breakdown of Complex Sentences
- Types of Dependent Clauses
- Examples of Complex Sentences
- Usage Rules for Complex Sentences
- Punctuation in Complex Sentences
- Common Mistakes When Using Complex Sentences
- Practice Exercises
- Advanced Topics in Complex Sentences
- Frequently Asked Questions
- Conclusion
Definition of a Complex Sentence
A complex sentence is a sentence that contains one independent clause and at least one dependent clause. The independent clause (also known as the main clause) can stand alone as a sentence because it expresses a complete thought. A dependent clause (also known as a subordinate clause) cannot stand alone as a sentence because it does not express a complete thought. It relies on the independent clause to give it meaning. Dependent clauses are often introduced by subordinating conjunctions or relative pronouns.
Subordinating conjunctions are words that connect a dependent clause to an independent clause and establish a relationship between them. Common subordinating conjunctions include after, although, as, because, before, even if, even though, if, since, so that, than, though, unless, until, when, where, and while. Relative pronouns, such as who, whom, which, and that, introduce adjective clauses.
For example, consider the following: “Because it was raining” is a dependent clause. It does not express a complete thought on its own. However, when combined with an independent clause, such as “I took my umbrella,” it forms a complex sentence: “Because it was raining, I took my umbrella.” The dependent clause provides context or reason for the action in the independent clause.
Structural Breakdown of Complex Sentences
The structure of a complex sentence can vary depending on where the dependent clause is placed relative to the independent clause. The most common structures are:
- Dependent Clause + Independent Clause: When the dependent clause comes first, it is usually followed by a comma. For instance: “Although I was tired, I finished my work.“
- Independent Clause + Dependent Clause: When the independent clause comes first, a comma is generally not needed unless the dependent clause is nonrestrictive (provides extra, non-essential information). For instance: “I finished my work although I was tired.“
Understanding these structures is crucial for proper punctuation and clarity. The subordinating conjunction or relative pronoun signals the start of the dependent clause and its relationship to the independent clause. The independent clause always contains a subject and a verb and expresses a complete thought, making it the core of the sentence.
Let’s consider another example: “If you practice regularly, you will improve your skills.” Here, “if you practice regularly” is the dependent clause, and “you will improve your skills” is the independent clause. The subordinating conjunction “if” introduces the condition under which the action in the independent clause will occur.
Types of Dependent Clauses
Dependent clauses can be classified into three main types based on their function within the sentence: adverbial clauses, noun clauses, and adjective clauses. Each type plays a different role and adds different kinds of information to the sentence.
Adverbial Clauses
Adverbial clauses function as adverbs, modifying the verb, adjective, or adverb in the independent clause. They provide information about time, place, manner, reason, purpose, condition, result, or concession. They are introduced by subordinating conjunctions. For example, in the sentence “I went for a walk after I finished my work,” the adverbial clause “after I finished my work” modifies the verb “went” and indicates the time when the action occurred.
Noun Clauses
Noun clauses function as nouns and can take the place of subjects, objects, complements, or appositives in the sentence. They are often introduced by words such as that, what, whatever, who, whoever, whom, whomever, which, whichever, when, where, why, and how. For example, in the sentence “I don’t know what I should do,” the noun clause “what I should do” acts as the object of the verb “know.”
Adjective Clauses
Adjective clauses function as adjectives, modifying nouns or pronouns in the independent clause. They provide additional information about the noun or pronoun they modify. They are usually introduced by relative pronouns (who, whom, which, that) or relative adverbs (where, when, why). For example, in the sentence “The book that I borrowed from the library is very interesting,” the adjective clause “that I borrowed from the library” modifies the noun “book” and tells us which book is being referred to.
Examples of Complex Sentences
To further illustrate the use of complex sentences, let’s examine examples of each type of dependent clause in various contexts. These examples will demonstrate how different subordinating conjunctions and relative pronouns can be used to create complex sentences with diverse meanings.
Adverbial Clause Examples
Adverbial clauses add context to the main clause by specifying time, reason, condition, or manner. They begin with subordinating conjunctions. These clauses can appear before or after the main clause, affecting punctuation.
The following table provides examples of complex sentences with adverbial clauses, showing the variety of subordinating conjunctions and the information they convey.
| Subordinating Conjunction | Complex Sentence |
|---|---|
| After | After the rain stopped, we went for a hike. |
| Although | Although he was tired, he continued working. |
| As | As I was walking down the street, I saw a friend. |
| Because | Because it was cold, I wore a coat. |
| Before | Before you leave, make sure to lock the door. |
| Even if | Even if it rains, we will still go to the park. |
| Even though | Even though he studied hard, he didn’t pass the test. |
| If | If you need help, just ask. |
| Since | Since you’re here, can you help me with this? |
| So that | I exercise regularly so that I can stay healthy. |
| Than | He is taller than I am. |
| Though | Though it was difficult, she persevered. |
| Unless | Unless you hurry, you will be late. |
| Until | I will wait until you arrive. |
| When | When I finish this task, I will take a break. |
| Where | Where there is a will, there is a way. |
| While | While I was cooking, the phone rang. |
| As long as | As long as you try your best, you will succeed. |
| Whenever | Whenever I feel stressed, I listen to music. |
| Wherever | Wherever you go, I will follow. |
| In order that | She saved money in order that she could travel the world. |
| As if | He acted as if he didn’t know anything. |
| As though | She looked as though she had seen a ghost. |
| Because of | Because of the rain, the game was cancelled. |
| Inasmuch as | Inasmuch as he is my friend, I will support him. |
| Now that | Now that the weather is nice, we can go outside. |
| Seeing that | Seeing that you’re busy, I’ll come back later. |
| So | He was very tired, so he went to bed early. |
| The moment | The moment she walked in, everyone cheered. |
Noun Clause Examples
Noun clauses function as nouns within the sentence, taking on roles such as subject, object, or complement. They are introduced by words like that, what, who, whom, which, why, when, where, and how. Understanding their function is key to constructing grammatically correct and meaningful complex sentences.
The following table showcases complex sentences with noun clauses, highlighting their varied roles within the sentence structure.
| Function | Complex Sentence |
|---|---|
| Subject | What he said surprised everyone. |
| Object of Verb | I don’t know what I should do. |
| Subject Complement | The problem is that we don’t have enough resources. |
| Object of Preposition | I am interested in what you think. |
| Appositive | The fact that she is late is concerning. |
| Direct Object | She understands why he is upset. |
| Indirect Object | Give whoever needs it a copy of the report. |
| Predicate Nominative | My belief is that everyone deserves a second chance. |
| Object Complement | They named the dog whatever name came to mind. |
| Adjective Complement | I am happy that you are doing well. |
| “That” Clause as Subject | That he arrived late was not surprising. |
| “What” Clause as Object | He didn’t understand what she meant. |
| “Who” Clause as Subject | Who wins the game is still uncertain. |
| “Whom” Clause as Object | I don’t know whom she invited to the party. |
| “Which” Clause as Subject | Which car he will buy is a mystery. |
| “Why” Clause as Object | The teacher explained why the experiment failed. |
| “When” Clause as Subject | When the meeting will start is not yet decided. |
| “Where” Clause as Object | The map shows where the treasure is hidden. |
| “How” Clause as Subject | How he managed to finish on time is impressive. |
| “Whether” Clause as Object | I’m unsure whether he’ll come to the event. |
| “If” Clause as Object | She asked if he would help her with the project. |
| Appositive to a Noun | The rumor that he resigned is probably false. |
| Complement of a Linking Verb | The truth is that he never wanted to leave. |
| Object of a Gerund | He enjoys what he does for a living. |
| Subject of an Infinitive | It is important that everyone participates. |
| Object of an Infinitive | She wants to know what the answer is. |
| Used with “It” as a Placeholder | It is unclear why she left so early. |
| Following “That” with Omission of “That” | I think he is a great teacher. (That he is a great teacher) |
Adjective Clause Examples
Adjective clauses modify nouns or pronouns by providing descriptive information. They begin with relative pronouns (who, whom, which, that) or relative adverbs (where, when, why), and are placed directly after the noun or pronoun they modify for clarity.
The following table illustrates the use of adjective clauses in complex sentences, demonstrating how they add detail and specificity to the nouns they describe.
| Relative Pronoun/Adverb | Complex Sentence |
|---|---|
| Who | The man who helped me was very kind. |
| Whom | The person whom I admire most is my mother. |
| Which | The car which I bought is very reliable. |
| That | The book that I read was fascinating. |
| Where | The city where I was born is beautiful. |
| When | The day when I met her was unforgettable. |
| Why | I don’t know the reason why he left. |
| Whose | The student whose project won the award is very talented. |
| That (defining) | The house that Jack built is now for sale. |
| Which (non-defining) | My car, which is very old, still runs well. |
| Who (referring to people) | The singer who performed last night was amazing. |
| Whom (formal, referring to people) | The professor whom the students respect is retiring. |
| Where (referring to places) | This is the park where we first met. |
| When (referring to time) | I remember the time when we went camping. |
| Whose (showing possession) | The artist whose paintings are on display is famous. |
| Adjective Clause at the Beginning | That I saw yesterday, the movie was fantastic. |
| Adjective Clause in the Middle | My sister, who lives in New York, is a doctor. |
| Adjective Clause at the End | He bought a car that was very expensive. |
| Nonrestrictive Clause with “Which” | The Eiffel Tower, which is in Paris, is a famous landmark. |
| Restrictive Clause with “That” | The only book that I enjoyed this year was a mystery novel. |
| Using “Who” with a Comma | My neighbor, who is a retired teacher, volunteers at the library. |
| Using “Whom” with a Preposition | The candidate to whom they gave the award was well-deserving. |
| Using “Where” with a Preposition | The country in which I grew up has a rich history. |
| Using “When” with a Specific Date | July 4th, when we celebrate independence, is a national holiday. |
| Using “Whose” to Show Relationship | The company whose products I use is environmentally conscious. |
| Adjective Clause with Omitted Relative Pronoun | The song I heard on the radio was beautiful. (The song that I heard…) |
| Adjective Clause Modifying a Pronoun | Everyone who attended the meeting agreed with the proposal. |
| Adjective Clause with a Complex Subject | The project that required extensive research was challenging. |
Usage Rules for Complex Sentences
Using complex sentences effectively requires adherence to specific grammatical rules. These rules govern the structure, punctuation, and placement of clauses within the sentence. Understanding these rules ensures clarity and precision in writing.
- Subordinating Conjunctions: Ensure that the correct subordinating conjunction is used to convey the intended relationship between the dependent and independent clauses. For example, use “because” to indicate a reason, “if” to express a condition, and “although” to show a contrast.
- Relative Pronouns: Use the appropriate relative pronoun (who, whom, which, that) to introduce adjective clauses. “Who” and “whom” refer to people, “which” refers to things, and “that” can refer to either people or things (though “that” is generally used in restrictive clauses).
- Clause Order: The order of the clauses can affect the emphasis of the sentence. Starting with the dependent clause can create a sense of anticipation, while starting with the independent clause can provide a direct statement followed by additional context.
- Agreement: Ensure that the verb in each clause agrees with its subject in number and person. This is particularly important in adjective clauses where the relative pronoun acts as the subject.
It’s also important to note that the choice of words within each clause should align with the overall tone and style of the writing. A complex sentence should not only be grammatically correct but also contribute to the overall effectiveness of the communication.
Punctuation in Complex Sentences
Punctuation is critical for clarity in complex sentences. The primary punctuation mark to consider is the comma, which is used to separate the dependent and independent clauses under specific conditions. Here’s a breakdown of the punctuation rules:
- Dependent Clause First: When the dependent clause comes before the independent clause, use a comma to separate the two clauses. For example: “Because it was raining, I took my umbrella.“
- Independent Clause First: When the independent clause comes before the dependent clause, a comma is generally not needed unless the dependent clause is nonrestrictive. A nonrestrictive clause provides additional, non-essential information and is set off by commas. For example: “My car, which is very old, still runs well.” (nonrestrictive) vs. “The car that I bought is very reliable.” (restrictive – no comma).
- Noun Clauses: Noun clauses generally do not require commas, regardless of their position in the sentence. For example: “I don’t know what I should do.“
- Series of Dependent Clauses: If there are multiple dependent clauses, each should be punctuated appropriately based on its position relative to the independent clause and other dependent clauses.
Proper punctuation ensures that the reader can easily understand the relationship between the clauses and the intended meaning of the sentence. Neglecting punctuation can lead to confusion and misinterpretation.
Common Mistakes When Using Complex Sentences
Even experienced writers can make mistakes when constructing complex sentences. Being aware of these common errors can help improve accuracy and clarity.
Here are some frequent mistakes:
- Comma Splices: Incorrectly joining two independent clauses with only a comma.
- Incorrect: I went to the store, I bought some milk.
- Correct: I went to the store, and I bought some milk. OR I went to the store; I bought some milk. OR Because I went to the store, I bought some milk.
- Run-on Sentences: Failing to properly separate independent clauses, resulting in a long, confusing sentence.
- Incorrect: I went to the store I bought some milk I came home.
- Correct: I went to the store, bought some milk, and came home. OR After I went to the store and bought some milk, I came home.
- Misplaced Modifiers: Placing a dependent clause in a way that it modifies the wrong word or phrase.
- Incorrect: Covered in mud, I washed the car. (Implies that “I” was covered in mud)
- Correct: I washed the car that was covered in mud.
- Incorrect Subordinating Conjunction: Using the wrong subordinating conjunction to connect the clauses.
- Incorrect: Despite it was raining, I took my umbrella.
- Correct: Because it was raining, I took my umbrella.
- Lack of Subject-Verb Agreement: Failing to make the verb agree with its subject in each clause.
- Incorrect: The book that I read are interesting.
- Correct: The book that I read is interesting.
- Dangling Participles: Occurs when the introductory phrase does not logically modify the subject of the main clause.
- Incorrect: Having finished the homework, the TV was turned on. (The TV didn’t finish the homework.)
- Correct: Having finished the homework, I turned on the TV.
By identifying and avoiding these common mistakes, writers can improve the clarity and effectiveness of their complex sentences.
Practice Exercises
Test your understanding of complex sentences with these exercises. Identify the dependent and independent clauses and classify the type of dependent clause (adverbial, noun, or adjective).
Exercise 1: Identify the clauses and their types.
| Sentence | Independent Clause | Dependent Clause | Type of Dependent Clause |
|---|---|---|---|
| Because it was raining, the game was cancelled. | The game was cancelled. | Because it was raining. | Adverbial |
| I don’t know what I should do. | I don’t know. | What I should do. | Noun |
| The book that I borrowed from the library is very interesting. | The book is very interesting. | That I borrowed from the library. | Adjective |
| If you study hard, you will succeed. | You will succeed. | If you study hard. | Adverbial |
| What she said made me think. | What she said made me think. | What she said. | Noun |
| The movie, which I saw last week, was amazing. | The movie was amazing. | Which I saw last week. | Adjective |
| Although he was tired, he kept working. | He kept working. | Although he was tired. | Adverbial |
| I am interested in what you think. | I am interested. | What you think. | Noun |
| The house where I grew up is still standing. | The house is still standing. | Where I grew up. | Adjective |
| She left after the movie ended. | She left. | After the movie ended. | Adverbial |
Exercise 2: Combine the following sentences into complex sentences using the subordinating conjunctions provided.
| Sentences | Subordinating Conjunction | Complex Sentence |
|---|---|---|
| I was feeling tired. I went to bed early. | Because | Because I was feeling tired, I went to bed early. |
| You finish your homework. You can watch TV. | If | If you finish your homework, you can watch TV. |
| He studied hard. He failed the test. | Although | Although he studied hard, he failed the test. |
| The rain stopped. We went for a walk. | After | After the rain stopped, we went for a walk. |
| She didn’t study. She failed the exam. | Since | Since she didn’t study, she failed the exam. |
| You practice every day. You will improve. | If | If you practice every day, you will improve. |
| I was late. I missed the bus. | Because | Because I was late, I missed the bus. |
| He is rich. He is not happy. | Although | Although he is rich, he is not happy. |
| You are ready. We can start the meeting. | When | When you are ready, we can start the meeting. |
| She exercises regularly. She wants to stay healthy. | So that | She exercises regularly so that she can stay healthy. |
Exercise 3: Rewrite the following sentences to include an adjective clause.
| Sentences | Adjective Clause | Complex Sentence |
|---|---|---|
| The book is interesting. I borrowed it from the library. | that I borrowed from the library | The book that I borrowed from the library is interesting. |
| The man is kind. He helped me yesterday. | who helped me yesterday | The man who helped me yesterday is kind. |
| The house is beautiful. I grew up there. | where I grew up | The house where I grew up is beautiful. |
| The student is talented. Her project won the award. | whose project won the award | The student whose project won the award is talented. |
| The movie was amazing. We saw it last week. | which we saw last week | The movie which we saw last week was amazing. |
| The cake was delicious. She baked it. | that she baked | The cake that she baked was delicious. |
| The flowers are beautiful. They are in the garden. | that are in the garden | The flowers that are in the garden are beautiful. |
| The song is popular. It was released this year. | that was released this year | The song that was released this year is popular. |
| The teacher is excellent. I learned a lot from her. | from whom I learned a lot | The teacher from whom I learned a lot is excellent. |
| The city is vibrant. I want to live there. | where I want to live | The city where I want to live is vibrant. |
Advanced Topics in Complex Sentences
For advanced learners, understanding the nuances of complex sentences involves exploring more intricate structures and stylistic choices. These include:
- Elliptical Clauses: These are clauses where some words are omitted because they are understood from the context. For example: “While (I was) walking, I listened to music.“
- Embedded Clauses: These are clauses nested within other clauses, creating complex layers of meaning. For example: “The book that I told you that I borrowed from the library is very interesting.“
- Varying Sentence Openings: Skillfully varying the placement of dependent and independent clauses to create different effects and maintain reader interest.
- Using Complex Sentences for Rhetorical Effect: Employing complex sentences to build suspense, emphasize certain points, or create a specific tone.
Mastering these advanced techniques can elevate writing to a higher level of sophistication and precision.
Frequently Asked Questions
Here are some frequently asked questions about complex sentences:
- What is the difference between a complex sentence and a compound sentence?
A complex sentence has one independent clause and one or more dependent clauses. A compound sentence has two or more independent clauses joined by a coordinating conjunction (and, but, or, nor, for, so, yet) or a semicolon.
- Can a complex sentence have more than one dependent clause?
Yes, a complex sentence can have multiple dependent clauses. For example: “Because it was raining and I didn’t have an umbrella, I stayed home.“
- Do I always need a comma when the dependent clause comes first?
Yes, generally, you should use a comma when the dependent clause comes before the independent clause. This helps to separate the clauses and improve readability.
- What if the dependent clause is very short? Do I still need a comma?
Even if the dependent clause is short, it’s generally best to use a comma for clarity. For example: “If possible, call me.“
- Can I start a sentence with a subordinating conjunction?
Yes, you can start a sentence with a subordinating conjunction as long as it is followed by an independent clause to complete the complex sentence.
- How do I know if a clause is restrictive or nonrestrictive?
A restrictive clause is essential to the meaning of the sentence and cannot be removed without changing the sentence’s core meaning. A nonrestrictive clause provides additional information but is not essential and can be removed without altering the core meaning. Nonrestrictive clauses are set off by commas.
- What are some common subordinating conjunctions to use in complex sentences?
Common subordinating conjunctions include after, although, as, because, before, even if, even though, if, since, so that, than, though, unless, until, when, where, and while.
- What is the purpose of using complex sentences in writing?
Complex sentences allow for the expression of more intricate ideas and relationships between them. By combining independent and dependent
clauses, writers can convey cause and effect, contrast, time sequences, and conditions more effectively than by using simple sentences alone. This variety improves the flow and rhythm of writing, making it more engaging for the reader.
Conclusion
Mastering the complex sentence is a pivotal step in developing advanced writing and communication skills. By understanding how to balance independent and dependent clauses, you gain the ability to express nuanced thoughts, provide detailed descriptions, and establish clear logical connections between ideas. Whether you are using adverbial clauses to set a scene, noun clauses to act as subjects, or adjective clauses to add specific details, these structures bring depth and sophistication to your prose.
Remember that the key to effective use lies in proper punctuation and the correct choice of subordinating conjunctions or relative pronouns. While complex sentences are powerful, they should be used in conjunction with simple and compound sentences to create a balanced and readable style. Through practice and attention to detail, you can use complex sentences to transform your writing from basic to professional and persuasive.
