A preposition is a word that connects a noun, pronoun, or noun phrase to another part of a sentence by expressing a relationship such as place, time, direction, cause, possession, or method. In “The keys are under the cushion,” under is the preposition, and the cushion is its object.
Key Facts at a Glance
- A preposition normally introduces a noun phrase called the object of the preposition.
- A prepositional phrase contains a preposition and its object, as in behind the door.
- Prepositions express relationships involving time, location, movement, agency, instrument, cause, and comparison.
- A preposition can contain modifiers before its object, as in under the old wooden bridge.
- English prepositions may contain one word, such as in, or several words, such as because of.
- English grammar does not prohibit ending a sentence with a preposition.
What Is a Preposition?
A preposition is a grammatical word that places one element in a relationship with another. The relationship may be physical, temporal, logical, causal, possessive, or abstract. In The cyclist rode through the tunnel, through connects the action rode with the noun phrase the tunnel and expresses movement within an enclosed passage.
Prepositions usually come before their objects, which explains their name. The object may be a noun, pronoun, noun phrase, or gerund phrase:
- near the station, noun phrase
- with her, pronoun
- after lunch, noun phrase
- by working carefully, gerund phrase
A preposition does not have one permanent meaning. On expresses surface contact in on the desk, a date in on Tuesday, and dependence in rely on evidence. Meaning comes from the preposition, its object, the surrounding verb, and the context.
What Does a Preposition Do in a Sentence?
A preposition provides a relationship that the sentence would otherwise leave unclear. Compare The package is the table with The package is on the table. The word on supplies the location and makes the relationship grammatical and interpretable.
Prepositional phrases commonly modify nouns or verbs:
- The woman in the blue coat arrived.
In the blue coat modifies woman. - The woman waited at the entrance.
At the entrance modifies waited. - We left because of the storm.
Because of the storm gives a reason for left.
Traditional grammar often calls the first phrase adjectival because it modifies a noun and the second adverbial because it modifies a verb. Modern grammar may describe both as adjuncts or modifiers, depending on their role.
How Does a Prepositional Phrase Work?
A prepositional phrase consists of a preposition followed by its complement, most often a noun phrase. The basic pattern is preposition + object, while optional modifiers can appear inside the object phrase: under + the very heavy blanket.
Consider the sentence The cat slept under the warm blanket:
| Element | Words | Function |
|---|---|---|
| Preposition | under | Introduces the relationship |
| Determiner | the | Identifies the blanket |
| Adjective | warm | Modifies blanket |
| Object noun | blanket | Completes the preposition |
| Full phrase | under the warm blanket | Gives the sleeping location |
A prepositional phrase can occur at the beginning, middle, or end of a sentence:
- After the meeting, we reviewed the notes.
- The report on climate policy contains six charts.
- The engineers tested the bridge under heavy loads.
Placement affects emphasis and sometimes clarity. A long introductory phrase may establish the setting before the main clause, while a phrase placed beside a noun usually modifies that noun.
How Do You Identify a Preposition?
Use three questions: what relationship is expressed, what word follows the relationship, and whether the resulting phrase modifies another sentence element.
- Find the relationship. Look for a word expressing location, time, movement, cause, method, or another connection.
- Find the complement. Ask what noun, pronoun, or noun phrase follows it.
- Read the complete phrase. Determine whether the phrase modifies a noun, verb, adjective, or the entire clause.
Example: Maya placed the folder beside the printer.
- Beside expresses location.
- The printer is the object.
- Beside the printer tells where Maya placed the folder.
A useful test is to remove the suspected preposition and its following phrase. If the core sentence remains grammatical but loses a relationship, the removed unit was probably a prepositional phrase: Maya placed the folder remains grammatical, but the location disappears.
What Are the Main Types of Prepositions?
The main semantic types are prepositions of time, place, direction, agency, instrument, cause, possession, comparison, and exception. A single preposition can belong to different types in different sentences, so categories describe meaning rather than permanent word classes.
Prepositions of Time
Time prepositions locate events in a schedule, period, sequence, or duration.
| Preposition | Typical time meaning | Example |
|---|---|---|
| at | Exact clock time or point | The train leaves at 7:20. |
| on | Day or named date | The exam is on Friday. |
| in | Month, year, season, or broad period | She graduated in 2024. |
| before | Earlier than an event | Wash your hands before dinner. |
| during | Within an event or period | No calls were allowed during the test. |
| since | From a past point until now or another reference point | He has worked here since May. |
| for | Length of time | They waited for two hours. |
| by | No later than a deadline | Submit the form by noon. |
The distinction between since and for is especially important. Since 2021 names a starting point, while for four years names a duration. The two phrases cannot normally exchange places.
Prepositions of Place and Position
Place prepositions describe where something exists in relation to another location or object.
| Preposition | Spatial relationship | Example |
|---|---|---|
| in | Inside an area or container | The documents are in the drawer. |
| on | Touching or supported by a surface | The phone is on the shelf. |
| under | Lower than and often covered by something | The shoes are under the bed. |
| above | Higher than, without requiring contact | A lamp hangs above the table. |
| between | In the space separating two entities | The café is between the bank and the library. |
| among | Within a group of more than two | She stood among the visitors. |
| beside | Next to | A bicycle rested beside the wall. |
| inside | Within the interior boundary | The children stayed inside the house. |
In usually describes an enclosed or bounded area, whereas on normally describes a surface. English also uses conventional expressions that must be learned individually: on a bus, in a car, at school, and at home.
Prepositions of Direction and Movement
Direction prepositions describe movement toward, into, across, around, or away from a place.
- to: We drove to the airport.
- toward: The dog ran toward the gate.
- into: She stepped into the elevator.
- onto: The child climbed onto the stage.
- through: Light passed through the window.
- across: They walked across the field.
- along: We cycled along the river.
- from: The bus came from Bristol.
- out of: He took the documents out of the cabinet.
The contrast between in and into shows the difference between position and movement. The child is in the pool describes location; the child jumped into the pool describes movement from outside to inside.
Prepositions of Agency and Instrument
By commonly identifies the agent responsible for an action in a passive sentence, while with commonly identifies the tool or material used to perform it.
- The novel was written by Toni Morrison.
- The parcel was delivered by a courier.
- She cut the paper with scissors.
- The technician opened the case with a specialized key.
Via identifies a route, channel, or communication method: Send the invoice via email. Through can identify an intermediary or process: We received the data through a partner organization.
Prepositions of Cause, Possession, and Comparison
Prepositions can express abstract relationships that are not physical.
- Cause: The match was canceled because of rain.
- Possession or association: The roof of the museum was repaired.
- Topic: They spoke about renewable energy.
- Comparison: This model is faster than the previous version.
- Exception: Everyone came except Daniel.
- Purpose: The fund was created for emergency repairs.
Some words traditionally classified as prepositions can introduce unusual complements. Except may be followed by a noun phrase, while than can introduce a noun phrase or a clause depending on the sentence.
What Are Simple, Compound, and Multiword Prepositions?
Simple prepositions contain one word, compound prepositions are historically or structurally complex single words, and multiword prepositions contain two or more words functioning together. The labels vary across grammar books, so the examples matter more than the terminology.
| Form | Examples | Typical register | Example sentence |
|---|---|---|---|
| Simple | in, at, by, with, from | Everyday and formal | We met at noon. |
| Compound | inside, outside, beneath, within | General or formal | The answer lies within the report. |
| Multiword | in front of, because of, next to | General, formal, or causal | The car stopped in front of the gate. |
| Formal multiword | in accordance with, pursuant to, with regard to | Legal or administrative | The decision followed in accordance with policy. |
Multiword prepositions can improve precision, but formal alternatives often increase word count. In plain-language editing, replace in order to with to, in the event that with if, and with regard to with about when the shorter form preserves the intended meaning.
Are Participial Words Prepositions?
Words such as concerning, regarding, including, given, and considering can function as prepositions when they introduce a noun phrase. Their classification depends on how they behave in the sentence.
- Regarding the contract, the manager requested revisions.
- Considering the evidence, the verdict was unexpected.
- The price is reasonable, including delivery.
- Given the circumstances, postponement was sensible.
The same spelling may function as a verb or participle in another structure. In The lawyer is considering the evidence, considering is part of the verb phrase. In Considering the evidence, the lawyer changed her recommendation, the word introduces a relationship between the evidence and the recommendation.
Which Preposition Should You Use: In, On, or At?
Use at for a point, on for a surface or day, and in for an enclosed space or broad period. The rule predicts many standard choices, but fixed expressions and transport phrases require attention to conventional usage.
| Context | Use | Correct example | Reason |
|---|---|---|---|
| Exact time | at | at 9:00 a.m. | A precise time point |
| Day or date | on | on 12 June | A calendar day |
| Month or year | in | in June, in 2026 | A broad period |
| Street address | at | at 18 King Street | A specific location point |
| Street or surface | on | on King Street, on the table | A line or surface |
| Enclosed place | in | in the office, in Canada | An interior or bounded area |
| Public transport | on | on the train, on a bus | Conventional usage for shared transport |
| Private vehicle | in | in a car, in a taxi | Conventional usage for enclosed personal transport |
Say at the bus stop, not normally in the bus stop, because the stop is treated as a location point. Say at noon, not on noon, because noon is treated as an exact time.
What Is the Difference Between a Preposition and a Conjunction?
A preposition introduces a noun phrase or another complement, while a conjunction connects clauses or other grammatical units. The word after can perform either role: after lunch contains a preposition, while after we ate contains a conjunction introducing a clause.
| Word | Prepositional use | Conjunction use |
|---|---|---|
| after | We left after lunch. | We left after the meeting ended. |
| before | Call me before sunset. | Call me before the store closes. |
| since | I have waited since Monday. | I have waited since you called. |
| while | Usually a conjunction | While the oven heated, we prepared the dough. |
A noun phrase contains a noun or pronoun as its central element. A clause contains a subject and a verb. That distinction provides a reliable diagnostic, although grammar terminology differs for some borderline constructions.
What Is the Difference Between a Preposition and an Adverb?
A preposition has a complement, while a related adverb or particle can appear without one. Compare She went inside the house with She went inside. In the first sentence, inside is a preposition because the house follows it; in the second, it functions adverbially.
Words such as around, behind, down, in, off, and outside can change category according to context:
- Preposition: The child ran around the garden.
- Adverb: The child ran around.
- Preposition: The plane flew over the city.
- Adverb or particle: The plane flew over.
The distinction matters when analyzing sentence structure, but ordinary writing usually requires choosing the correct meaning rather than assigning a label.
Can You End a Sentence With a Preposition?
Yes, a sentence can end with a preposition when natural English places the preposition at the end, especially in questions, relative clauses, and phrasal verbs. The prohibition is a style preference inherited from Latin-based grammar instruction, not a rule of modern English syntax.
- Natural: Who are you speaking with?
- Formal: With whom are you speaking?
- Natural: That is the issue we were arguing about.
- Formal: That is the issue about which we were arguing.
The formal version may suit a legal submission or ceremonial speech, but it can sound stiff in ordinary conversation. Do not move a preposition merely to satisfy a blanket rule. Move it when the revised sentence improves clarity, emphasis, or register.
How Do Prepositions Work in Phrasal Verbs?
Phrasal verbs combine a verb with a particle, and the particle may resemble a preposition while behaving differently. In turn off the light, off changes the meaning of turn; in walk off the stage, off introduces the noun phrase the stage and expresses movement.
| Expression | Meaning | Example |
|---|---|---|
| look after | Care for | Nina looks after her nephew. |
| depend on | Be determined by | Results depend on sample quality. |
| run into | Encounter unexpectedly | I ran into an old colleague. |
| put off | Delay | They put off the launch. |
| agree with | Share an opinion | I agree with the proposal. |
| listen to | Pay attention to sound | Please listen to the instructions. |
Learners should memorize dependent combinations as chunks. The correct phrase is interested in, responsible for, similar to, depend on, and good at, not merely the adjective or verb in isolation.
What Words Can Follow a Preposition?
A preposition can be followed by a noun phrase, pronoun, gerund phrase, or occasionally another type of complement recognized by a particular grammar framework. A finite clause usually requires a conjunction or a special preposition such as despite in a clause-like construction.
Examples include:
- Noun: under pressure
- Pronoun: between you and me
- Noun phrase: near the north entrance
- Gerund phrase: after leaving the office
- Wh-clause in formal usage: depending on what they decide
Use an object pronoun after a preposition in formal standard English: between you and me, not between you and I. The pronoun is the object of between, so the objective forms me, him, her, us, and them are appropriate.
What Are Common Preposition Mistakes?
The most common errors involve unnecessary words, incorrect collocations, confusion between related location terms, and pronoun case. Editing improves when writers diagnose the relationship first instead of translating a preposition directly from another language.
| Error type | Incorrect example | Correct example | Fix |
|---|---|---|---|
| Unnecessary preposition | Where are you going to? | Where are you going? | Remove redundant to |
| Wrong time phrase | We met on noon. | We met at noon. | Use at for a time point |
| Wrong collocation | She depends of him. | She depends on him. | Learn verb plus preposition |
| Pronoun case | Between you and I | Between you and me | Use object case |
| Wrong movement term | He walked in the room. | He walked into the room. | Use into for movement |
| Excessive formality | In order to respond | To respond | Prefer the shorter phrase |
A deletion test catches some redundancy, but it cannot replace meaning analysis. In She went off the road, removing off changes the location and may change the safety meaning, so the preposition is not redundant.
Why Do Prepositions Cause Problems for Language Learners?
Prepositions cause difficulty because languages divide spatial and abstract relationships differently, while English also contains many fixed verb-preposition and adjective-preposition combinations. Direct translation therefore produces forms such as married with instead of standard English married to, or discuss about instead of discuss.
A practical learning sequence works better than memorizing an isolated alphabetical list:
- Learn high-frequency contrasts, especially in, on, at, to, and for.
- Record collocations as complete units, such as apply for a job.
- Group examples by situation, including transport, dates, addresses, and work.
- Write original sentences and compare them with a learner dictionary.
- Review recurring errors rather than treating every mistake as unrelated.
The Cambridge Dictionary, Oxford Learner’s Dictionaries, and Merriam-Webster provide usage examples, but a dictionary entry should be checked for the specific verb, adjective, or noun being used.
How Can Writers Reduce Unnecessary Prepositions?
Writers can reduce unnecessary prepositions by removing redundant phrases, replacing inflated expressions, and choosing direct verbs. Concision helps most when a prepositional phrase carries no location, time, cause, or other meaning.
| Wordier expression | Shorter alternative | Example |
|---|---|---|
| in order to | to | To reduce costs, revise the schedule. |
| due to the fact that | because | Delay occurred because roads flooded. |
| at this point in time | now | The system is unavailable now. |
| in the event of | if | If the alarm sounds, leave. |
| with reference to | about | I am writing about the invoice. |
| make a decision on | decide about | The committee will decide about the proposal. |
Do not delete every prepositional phrase. The report on battery safety and the report about battery safety carry useful topic information, while the report in relation to the matter may be unnecessarily vague. Precision comes before word-count reduction.
When Should Formal Writers Keep Complex Prepositions?
Formal writers should keep a complex preposition when it defines a legal relationship, condition, exception, or procedural boundary more accurately than a shorter alternative. Complex phrases are not automatically more precise, however, and unnecessary legal phrasing can conceal responsibility or timing.
- In accordance with Section 4 identifies a governing rule.
- Subject to approval identifies a condition.
- Notwithstanding the delay identifies an exception.
- On behalf of the client identifies representation.
- Pursuant to the agreement identifies an authority or contractual basis.
Plain-language editors should ask whether the phrase identifies a real relationship. If with regard to means about, the shorter form is usually clearer. If subject to determines whether an obligation takes effect, replacing it casually may remove legal meaning.
What Are Important Special Cases?
Several short words create disproportionate confusion because their spelling or meaning overlaps with another grammatical function. The most important cases involve to, like, as, than, and particles in phrasal verbs.
Prepositional To Versus Infinitive To
Prepositional to introduces a noun phrase or gerund, while infinitival to introduces the base form of a verb.
- Preposition: We walked to the station.
- Preposition: She is committed to improving access.
- Infinitive marker: She wants to improve access.
The phrase committed to improving, not committed to improve, follows the preposition because improving functions as a gerund phrase. This pattern also appears in look forward to meeting, object to paying, and be accustomed to working.
Like Versus As
Like commonly introduces a noun phrase for comparison, while as can introduce a clause or describe a role.
- He runs like a professional.
- He works as a professional.
- Do it as I showed you.
Informal speech sometimes uses like before a clause, but formal editing may prefer as when the meaning is “in the way that.”
Among Versus Between
Between is standard for relationships involving two entities and is also used for separate relationships within larger groups. Among emphasizes undifferentiated membership in a group.
- The agreement is between France and Spain.
- Negotiations continued between the five departments.
- She felt comfortable among friends.
The simplistic rule that between can only refer to two items is inaccurate. The intended relationship determines the choice.
Frequently Asked Questions About Prepositions
How Many Prepositions Are There in English?
English has no single agreed number of prepositions. A narrow inventory may list roughly 70 common primary prepositions, while broader dictionaries and grammar systems include multiword expressions, marginal forms, and words that change category by context. Counting because of, in front of, and regarding depends on the grammatical framework.
What Is the Easiest Way to Find a Preposition?
Look for a word that introduces a noun phrase and expresses a relationship such as place, time, movement, cause, or method. In The student worked beside her tutor, beside introduces her tutor and forms the prepositional phrase beside her tutor.
Is “To” Always a Preposition?
No. To is a preposition in go to school and dedicated to teaching, but it is an infinitive marker in want to learn. Check what follows it: a noun phrase or gerund indicates prepositional to, while a base-form verb indicates infinitival to.
Should You Avoid Starting a Sentence With a Prepositional Phrase?
No. An introductory prepositional phrase is grammatical and often useful for establishing time, place, or condition: After the inspection, the factory reopened. Add a comma when the introductory phrase is long or when the pause improves readability, but short phrases may appear without one in some styles.
What Is the Difference Between “In” and “Into”?
In describes location, while into normally describes movement toward the interior of a place or object. The keys are in the drawer describes position; She put the keys into the drawer describes movement. Informal speech sometimes uses in for both meanings.
Can a Preposition Have More Than One Meaning?
Yes. By can express agency in painted by Rivera, proximity in sit by the window, a deadline in finish by Friday, or method in send it by email. Context and the word connected to the preposition determine the intended relationship.
The Bottom Line
Prepositions are words that connect nouns, pronouns, or noun phrases to other sentence elements and express relationships of time, place, movement, cause, method, possession, and comparison. A prepositional phrase contains the preposition and its complement, as in under the bridge or after the meeting. To answer “what are prepositions definition plus examples,” identify the relationship, locate the object, and choose the expression that matches the intended meaning and register.
