Subordinating Conjunctions: Definition, Usage, and Examples

Subordinating conjunctions are essential grammatical tools that connect a dependent clause to an independent clause, establishing a relationship of time, cause, contrast, or condition. These versatile words, including because, although, whenever, unless, and since, allow writers to construct complex sentences that convey nuanced meanings and sophisticated logical connections. By understanding how to use these connectors, students and professional writers alike can move beyond simple, repetitive sentence structures to create prose that is fluid, descriptive, and intellectually engaging. This guide provides a deep dive into the mechanics of subordination, offering clear rules for punctuation, categorization, and stylistic application in everyday English communication.

Table of Contents

• Definition and Fundamental Concept
• Structural Breakdown of Complex Sentences
• Categories of Subordinating Conjunctions
• Conjunctions of Time
• Conjunctions of Cause and Effect
• Conjunctions of Contrast and Concession
• Conjunctions of Condition
• Conjunctions of Place and Manner
• Essential Usage Rules and Punctuation
• Common Mistakes and How to Avoid Them
• Advanced Topics: Elliptical Clauses and Relative Pronouns
• Practice Exercises with Answer Key
• Frequently Asked Questions (FAQ)
• Conclusion

Definition and Fundamental Concept

A subordinating conjunction is a word or phrase that links a dependent (subordinate) clause to an independent (main) clause. The primary function of these words is to provide a transition that indicates the importance of the independent clause while providing necessary context through the dependent clause. In the hierarchy of a sentence, the independent clause can stand alone as a complete thought, whereas the dependent clause, introduced by the subordinating conjunction, relies on the main clause for its full meaning.

Linguistically, these conjunctions perform two vital roles. First, they provide a bridge between ideas, showing how one action relates to another. Second, they reduce the importance of one clause so that the reader understands which piece of information is the “main event” and which is the “supporting detail.” For example, in the sentence “I stayed home because it was raining,” the main fact is the staying home, while the reason is the rain.

Unlike coordinating conjunctions (FANBOYS: for, and, nor, but, or, yet, so), which join two equal elements, subordinating conjunctions create an unequal relationship. This inequality is what allows for the “complex sentence” structure. Without these connectors, our writing would consist of short, choppy sentences that fail to show the logical flow of our thoughts or the timing of events.

Structural Breakdown of Complex Sentences

To master subordinating conjunctions, one must understand the anatomy of a complex sentence. A complex sentence is composed of at least one independent clause and at least one dependent clause. The subordinating conjunction always stays with the dependent clause, regardless of where that clause is placed within the sentence.

There are two primary patterns for organizing these sentences. The first pattern places the dependent clause at the beginning of the sentence: [Subordinating Conjunction + Subject + Verb], [Independent Clause]. In this structure, a comma is mandatory to separate the two clauses. For instance: “Because she was tired, she went to bed early.”

The second pattern places the independent clause first: [Independent Clause] [Subordinating Conjunction + Subject + Verb]. In most cases, when the independent clause comes first, no comma is required before the conjunction. For instance: “She went to bed early because she was tired.” Understanding this structural flexibility is key to varying sentence rhythm and emphasis in writing.

Categories of Subordinating Conjunctions

Subordinating conjunctions are typically categorized by the type of relationship they establish between clauses. These categories help writers choose the precise word to express their intended meaning. The main categories include time, cause and effect, contrast/concession, condition, place, and manner.

Each category serves a specific logical purpose. Time conjunctions establish a chronological sequence; cause and effect conjunctions explain the “why” behind an action; contrast conjunctions highlight differences or unexpected results; and conditional conjunctions set the terms under which an action will occur. By categorizing these words, learners can more easily memorize their functions and apply them correctly in various contexts.

Conjunctions of Time

Time-based subordinating conjunctions are perhaps the most frequently used. they tell us when something happened or for how long an action persisted. These words are essential for storytelling and technical writing where sequence is paramount. The table below provides a comprehensive list of time-related subordinating conjunctions with examples of their use.

The following table lists 25 examples of time-related subordinating conjunctions and their application in sentences to demonstrate chronological relationships.

Conjunction	Example Sentence	Context/Usage
After	After the movie ended, we went for pizza.	Indicates a later time.
As soon as	As soon as the bell rings, the students leave.	Indicates immediate succession.
As long as	I will stay as long as you need me.	Indicates duration.
Before	Wash your hands before you eat dinner.	Indicates an earlier time.
Once	Once you finish your chores, you can play.	Indicates a starting point.
Since	I haven’t seen him since we graduated.	Indicates time from the past to now.
Until	Wait here until I return.	Indicates a limit in time.
When	When it rains, the roof leaks.	Indicates a specific point in time.
Whenever	Whenever I see her, she is smiling.	Indicates “every time.”
While	While I was sleeping, the phone rang.	Indicates simultaneous actions.
By the time	By the time we arrived, the food was cold.	Indicates a deadline or completion point.
Now that	Now that you’re here, we can start.	Indicates a new state of time.
As	He arrived as I was leaving.	Indicates simultaneous actions.
Till	We danced till the sun came up.	Informal version of until.
Directly	Directly he saw me, he ran away.	Chiefly British; means “as soon as.”
Immediately	Immediately the news broke, people gathered outside.	Shows instant reaction.
Every time	Every time it snows, the trains are delayed.	Shows repetitive timing.
The moment	The moment I saw her, I knew she was the one.	Specific point in time.
The second	The second you hear the alarm, exit the building.	Extremely precise timing.
No sooner… than	No sooner had I sat down than the phone rang.	Correlative subordinating structure.
Hardly… when	Hardly had I finished when the power went out.	Shows a nearly simultaneous event.
Scarcely… when	Scarcely had he arrived when he had to leave.	Similar to “hardly.”
Just as	Just as I was about to call, you walked in.	Exact same moment.
The day (that)	The day that we met was the happiest of my life.	Specific date/time period.
Each time	Each time he speaks, he says something wise.	Repetitive occurrences.

Conjunctions of Cause and Effect

Cause and effect conjunctions explain why something happens. They connect a result with its reason. Using these words correctly ensures that the logic of your argument is clear to the reader. While “because” is the most common, others like “inasmuch as” or “since” can add variety and formal tone to your writing.

In academic writing, these conjunctions are vital for building arguments. They allow the writer to present evidence (the dependent clause) in support of a claim (the independent clause). Note that some of these, like “since” and “as,” can also function as time conjunctions, so context is crucial for determining their meaning.

This table showcases 20 cause and effect subordinating conjunctions and phrases that help link reasons to results.

Conjunction	Example Sentence	Nuance
Because	I am late because my car broke down.	Direct reason.
Since	Since you are here, you can help me.	Reason that is already known.
As	As it was a holiday, the shops were closed.	Similar to since/because.
So that	I studied hard so that I would pass.	Indicates purpose/intent.
In order that	We moved the chair in order that he could sit.	Formal purpose.
Inasmuch as	Inasmuch as he is the leader, he is responsible.	Very formal; considering that.
Now that	Now that the rain has stopped, let’s go out.	Reason based on a new situation.
Seeing that	Seeing that it’s late, we should go home.	Considering the fact.
For fear that	He stayed quiet for fear that he might wake her.	Reason based on avoiding an outcome.
Lest	He ran fast lest he should be late.	Archaic/Formal; to avoid the risk of.
Given that	Given that he is new, he did a great job.	Considering the specific circumstances.
On the grounds that	He was fired on the grounds that he was lazy.	Formal/Legalistic reason.
In that	The plan is flawed in that it ignores costs.	Explaining a specific aspect.
Due to the fact that	He failed due to the fact that he didn’t study.	Wordy but common in formal reports.
Owing to the fact that	Owing to the fact that it’s wet, we’ll stay in.	Formal alternative to because.
Why	I don’t know why she left so early.	Used in noun clauses as a reason.
That	I am glad that you could come.	Often used after adjectives of emotion.
So	It was cold, so I put on a coat.	Often used as a coordinator, but acts similarly.
As long as	As long as you’re going, I’ll go too.	Conditional reason.
By reason of	He was excused by reason of his illness.	Formal/Legal.

Conjunctions of Contrast and Concession

These conjunctions are used to show a relationship of opposition or unexpected results. They are incredibly useful for acknowledging a counter-argument or a surprising fact while still maintaining the primary focus of the sentence. Words like “although” and “even though” are the workhorses of this category.

Concession is a specific type of contrast where you yield a point. For example, saying “Although it was expensive, I bought it” concedes that the price was high but emphasizes the purchase. This adds depth to writing by showing that the author has considered multiple sides of a situation.

The table below provides 20 examples of conjunctions used to express contrast, concession, and opposition.

Conjunction	Example Sentence	Function
Although	Although it was cold, he didn’t wear a coat.	General contrast.
Even though	Even though I’m tired, I will finish this.	Stronger contrast than although.
Though	I’ll be there, though I might be late.	Informal/Less emphatic contrast.
While	While I like tea, my brother prefers coffee.	Direct comparison/contrast.
Whereas	She is very quiet, whereas her sister is loud.	Formal direct contrast.
Even if	Even if it rains, the game will continue.	Hypothetical concession.
Despite the fact that	He won despite the fact that he was injured.	Formal concession.
In spite of the fact that	They stayed together in spite of the fact that they fought.	Similar to despite.
Whether… or	Whether you like it or not, we are leaving.	Alternative conditions.
Much as	Much as I love the city, I need the country.	Showing strong feeling vs. reality.
Notwithstanding that	Notwithstanding that it was late, he continued.	Very formal/Legalistic.
Albeit	It was a good day, albeit a tiring one.	Often introduces a single word or phrase.
Regardless of whether	I will go regardless of whether you come.	Showing indifference to conditions.
Only	I would go, only I don’t have any money.	Informal contrast (similar to but).
Except that	The car is perfect, except that it’s too small.	Showing an exception.
Save that	He knew nothing, save that he was lost.	Archaic/Literary exception.
Even	He was kind, even when he was angry.	Showing an extreme contrast.
But that	I would have helped, but that I was busy.	Showing a preventing factor.
Whilst	Whilst I agree with you, I cannot help.	British variation of while.
Rather than	I prefer to walk rather than drive.	Preference contrast.

Conjunctions of Condition

Conditional subordinating conjunctions establish the “rules” of the sentence. They indicate that the action in the main clause will only happen if the criteria in the dependent clause are met. The most common of these is “if,” but there are many others that provide more specific conditions.

These are essential for expressing hypotheses, threats, promises, and requirements. For example, “unless” is a negative condition meaning “if not.” Using “provided that” implies a formal agreement or a specific necessity. Mastering these allows for precise communication of expectations.

This table lists 20 conditional subordinating conjunctions that define the circumstances required for an action to occur.

Conjunction	Example Sentence	Condition Type
If	If you study, you will pass the exam.	General condition.
Unless	Unless you hurry, we will miss the bus.	Negative condition (if not).
Provided that	You can go provided that you finish your work.	Requirement/Agreement.
Providing that	Providing that the weather is good, we’ll hike.	Interchangeable with provided that.
As long as	You can stay as long as you’re quiet.	Condition of duration/behavior.
So long as	So long as he pays, I don’t care.	Similar to as long as.
In case	Take an umbrella in case it rains.	Precautionary condition.
Assuming that	Assuming that you’re right, we need a new plan.	Hypothetical condition.
On condition that	He lent me money on condition that I pay it back.	Specific contractual condition.
Even if	Even if I had the money, I wouldn’t buy it.	Hypothetical/Irrelevant condition.
Whether or not	I’m going whether or not it rains.	Inevitable action regardless of condition.
Only if	I will help you only if you ask nicely.	Restrictive condition.
Suppose/Supposing	Supposing you won the lottery, what would you do?	Imaginary condition.
What if	What if we get lost in the forest?	Questioning a condition.
Lest	Be careful lest you fall.	To prevent a condition.
In the event that	In the event that fire breaks out, use the stairs.	Formal/Emergency condition.
Should	Should you need help, please call me.	Formal “if.”
Were	Were I you, I would take the job.	Subjunctive/Hypothetical.
Had	Had I known, I would have come sooner.	Past hypothetical condition.
Provided	Dinner is at eight, provided the oven works.	Shortened form of provided that.

Conjunctions of Place and Manner

Conjunctions of place tell us where something is happening or where an action is directed. Conjunctions of manner tell us how something is done. While these categories are smaller than time or cause, they are vital for providing descriptive detail and spatial context.

For example, “wherever” suggests a universal location, while “as though” creates a comparison to describe a behavior. These words help paint a clearer picture for the reader, moving the sentence from a simple statement of fact to a detailed observation.

The following table lists 15 examples of place and manner subordinating conjunctions to help describe location and style.

Conjunction	Example Sentence	Category
Where	I live where the mountains meet the sea.	Place (Specific).
Wherever	She goes wherever the wind blows.	Place (General).
Everywhere	Everywhere I look, I see her face.	Place (Universal).
As	Do as I say, not as I do.	Manner (Comparison).
As if	He looks as if he hasn’t slept in days.	Manner (Hypothetical).
As though	It felt as though the world had stopped.	Manner (Hypothetical).
How	I wonder how he manages to stay so calm.	Manner (Method).
The way	I love the way she laughs.	Manner (Style).
Whence	Return to the place whence you came.	Place (Origin – Archaic).
Whither	Whither thou goest, I will go.	Place (Direction – Archaic).
In that	He is lucky in that he has many friends.	Manner (Specific respect).
Like	He speaks like he’s the boss.	Manner (Informal comparison).
As… so	As the father is, so is the son.	Manner (Proportional).
Wherefrom	The source wherefrom the water flows is pure.	Place (Source).
Whereby	It’s a system whereby everyone wins.	Manner (Means/Agency).

Essential Usage Rules and Punctuation

The most important rule regarding subordinating conjunctions involves punctuation, specifically the use of the comma. If the dependent clause (the one starting with the conjunction) comes before the independent clause, you must use a comma. This acts as a signal to the reader that the introductory thought is finished and the main point is about to begin. For example: “While I was eating, the dog barked.”

Conversely, if the independent clause comes before the dependent clause, you generally do not need a comma. The conjunction itself acts as the divider. For example: “The dog barked while I was eating.” However, there is a stylistic exception for conjunctions of extreme contrast like although or though. Even when they come at the end of a sentence, a comma is often used to emphasize the pause and the contrast: “I went to the party, although I didn’t want to.”

Another crucial rule is avoiding “double conjunctions.” In some languages, it is common to use both a subordinating and a coordinating conjunction together (e.g., “Although it was raining, but I went out”). In English, this is a grammatical error. You must choose one or the other: “Although it was raining, I went out” OR “It was raining, but I went out.”

Common Mistakes and How to Avoid Them

One of the most frequent errors is the sentence fragment. This occurs when a writer leaves a dependent clause standing alone without an independent clause to support it. For example, “Because I was late.” is not a complete sentence; it is a fragment. To fix this, it must be attached to a main thought: “Because I was late, I missed the introduction.”

Another common mistake is the comma splice or the run-on sentence where a subordinating conjunction is missing entirely. Writers often try to join two independent thoughts with just a comma: “I was tired, I went to bed.” This should be corrected using a subordinating conjunction: “Because I was tired, I went to bed.”

Finally, misplacing the conjunction can change the entire meaning of the sentence. Consider the difference between “I cried because she left” and “Because I cried, she left.” The first implies her leaving was the cause of the tears; the second implies the tears caused her to leave. Always ensure the conjunction is attached to the clause that represents the condition, cause, or time you intend to modify.

Advanced Topics: Elliptical Clauses and Relative Pronouns

For advanced learners, it is important to understand elliptical clauses. These are dependent clauses where some words are omitted because they are understood from the context. This often happens with time and contrast conjunctions. For example, instead of saying “While I was walking to the store, I saw a cat,” you can say “While walking to the store, I saw a cat.” The subject “I” and the verb “was” are omitted but understood.

It is also useful to distinguish between subordinating conjunctions and relative pronouns (who, which, that, whom, whose). While both introduce dependent clauses, relative pronouns act as the subject or object within their own clause, whereas subordinating conjunctions are purely functional connectors. For example, in “The man who called is my uncle,” “who” is the subject of “called.” In “I left because he called,” “because” just links the two ideas.

Lastly, some words can function as both prepositions and subordinating conjunctions. Words like after, before, and until can be followed by a noun (preposition) or a full clause (conjunction). Example as preposition: “After the game.” Example as conjunction: “After the game ended.” Understanding this distinction helps in identifying sentence parts correctly.

Practice Exercises with Answer Key

Test your knowledge of subordinating conjunctions with these exercises. The first set focuses on identifying the correct conjunction, while the second set focuses on proper punctuation.

Exercise 1: Fill in the Blanks

Choose the most appropriate subordinating conjunction from the list (because, although, if, while, unless, since).

1. ________ it was raining, we decided to go for a walk anyway.
2. I will not talk to him ________ he apologizes first.
3. We have lived in this house ________ I was five years old.
4. I listened to music ________ I was doing my homework.
5. You can have dessert ________ you eat all your vegetables.
6. ________ I was exhausted, I stayed up to finish the book.
7. The cat ran under the bed ________ it heard a loud noise.
8. ________ you see him, tell him I said hello.
9. He failed the test ________ he didn’t study at all.
10. I’ll be at the library ________ you need me.

Exercise 2: Punctuation Check

Rewrite the following sentences, adding commas where necessary. If no comma is needed, write “Correct.”

1. Because the traffic was heavy I arrived late.
2. I arrived late because the traffic was heavy.
3. Although it was expensive she bought the dress.
4. She bought the dress although it was expensive.
5. Unless it stops snowing we cannot drive.
6. We cannot drive unless it stops snowing.
7. While the baby was sleeping I cleaned the kitchen.
8. I cleaned the kitchen while the baby was sleeping.
9. Since you are already here you might as well stay for dinner.
10. If you want to win you must practice every day.

Answer Key

Exercise 1 Answers	Exercise 2 Answers
1. Although	1. Because the traffic was heavy, I arrived late.
2. unless	2. Correct
3. since	3. Although it was expensive, she bought the dress.
4. while	4. She bought the dress, although it was expensive. (Optional comma for contrast)
5. if	5. Unless it stops snowing, we cannot drive.
6. Although	6. Correct
7. because	7. While the baby was sleeping, I cleaned the kitchen.
8. If / Whenever	8. Correct
9. because	9. Since you are already here, you might as well stay for dinner.
10. if / in case	10. If you want to win, you must practice every day.

Frequently Asked Questions (FAQ)

1. Can a sentence start with a subordinating conjunction?

Yes, absolutely. Many people are taught in primary school not to start sentences with “Because,” but this is a stylistic suggestion to prevent fragments, not a grammatical rule. As long as you include an independent clause after the dependent one (and separate them with a comma), starting with a conjunction is perfectly correct and often very effective for emphasis.

2. What is the difference between “because” and “since”?

In terms of cause and effect, they are often interchangeable. However, “because” focuses more on the reason itself, whereas “since” is often used when the reason is already known to the listener. Additionally, “since” has a temporal meaning (time) that “because” does not have.

3. Do I always need a comma after a dependent clause at the beginning?

In standard formal English, yes. The comma helps the reader identify where the introductory information ends and the main subject begins. In very short sentences, some writers omit it, but for clarity and academic writing, it should always be included.

4. Is “so” a subordinating conjunction?

Technically, “so” is a coordinating conjunction (part of FANBOYS). However, “so that” is a subordinating conjunction. “So” usually connects two equal independent clauses, while “so that” introduces a dependent clause of purpose.

5. How many subordinating conjunctions are there in English?

There are dozens of subordinating conjunctions. While there is a core list of about 20-30 common ones, many phrases (like “as soon as” or “in the event that”) also function as subordinating conjunctions. It is more important to understand their function than to memorize a complete list.

6. Can “that” be a subordinating conjunction?

Yes, “that” often functions as a subordinating conjunction, especially when introducing noun clauses or expressing a result. For example: “I believe that you are right.” In this case, it connects the main verb “believe” to the object clause.

7. What is the difference between a subordinating conjunction and a transition word like “however”?

Transition words (conjunctive adverbs) like “however,” “therefore,” and “moreover” connect two independent sentences and require a semicolon or a period. Subordinating conjunctions like “although” create a dependent clause that cannot stand alone. You cannot say “Although, I went home.” but you can say “However, I went home.”

8. Why are they called “subordinating”?

They are called “subordinating” because they make the clause they introduce “subordinate” (lower in rank or importance) to the main clause. They turn a complete thought into a piece of information that depends on something else to make sense.

Conclusion

Mastering subordinating conjunctions is a transformative step in any writer’s journey. These words are the glue that holds complex ideas together, allowing for the expression of time, logic, and condition with precision. By understanding the different categories—such as time, cause, contrast, and condition—and following the essential punctuation rules, you can significantly improve the clarity and flow of your writing. Remember that the placement of the dependent clause matters for both emphasis and punctuation. Whether you are using because to explain a reason or although to show a contrast, these tools enable you to communicate more effectively. Keep practicing, vary your sentence structures, and don’t be afraid to start a sentence with a conjunction as long as you complete the thought!