Quick Answer
A preposition is a word that shows the relationship between a noun (or pronoun) and other words in a sentence — usually relating to time, place, or direction. Examples: in, on, at, under, before, with, about.
A preposition is a word that shows how a noun or pronoun relates to another word in the sentence. Prepositions usually show location, time, direction, or relationship.
Words such as in, on, at, under, over, before, after, and with are all prepositions. They almost always come before a noun or pronoun, forming a unit called a prepositional phrase.
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What Is a Preposition?
A preposition connects a noun or pronoun to the rest of the sentence, usually showing where, when, or how something relates to something else.
For example:
- The keys are on the table.
- We arrived before noon.
- She walked toward the door.
Quick definition: A preposition is a word placed before a noun or pronoun to show its relationship to another word in the sentence.
Types of Prepositions
| Type | What It Shows | Examples |
|---|---|---|
| Time | When something happens | at, on, in, before, after, during |
| Place | Where something is | in, on, at, under, above, between |
| Direction | Movement toward or away from something | to, toward, into, through, across |
Prepositions of Time
Prepositions of time tell us when something happens.
- At for specific times: at 6pm, at noon
- On for days and dates: on Monday, on July 4th
- In for months, years, and longer periods: in March, in 2024, in the morning
Prepositions of Place
Prepositions of place tell us where something is located.
- At for a specific point: at the door, at the corner
- On for a surface: on the wall, on the shelf
- In for an enclosed space: in the box, in the room
Other common place prepositions: under, over, above, below, between, among, behind, in front of, next to.
Prepositions of Direction
Prepositions of direction show movement toward, away from, or through something: to, toward, into, onto, through, across, along, past.
- She walked into the room.
- The car drove through the tunnel.
- We hiked along the trail.
Prepositional Phrases
A prepositional phrase is a preposition plus its object (a noun or pronoun) and any modifiers. Prepositional phrases act as adjectives or adverbs in a sentence.
- The book on the table is mine. (describes “book” — acts as an adjective)
- She ran into the room. (describes “ran” — acts as an adverb)
Ending a Sentence With a Preposition
You may have heard that you should never end a sentence with a preposition. That rule is outdated and largely a myth — modern style guides accept it in everyday writing, especially when the alternative sounds stiff or unnatural.
- Natural: “What are you looking for?”
- Stiff, avoid: “For what are you looking?”
In formal writing, you can still choose to rearrange the sentence — but it’s a style choice, not a grammar error.
Common Preposition Mistakes
- Confusing “in,” “on,” and “at” for time. Use at for exact times, on for days, in for longer periods.
- Using the wrong preposition after a verb. Write “married to,” not “married with”; “good at,” not “good in.”
- Adding unnecessary prepositions. Write “where is it,” not “where is it at.”
- Confusing “between” and “among.” Use between for two items, among for three or more.
- Overcorrecting sentence-ending prepositions. Forcing “to whom did you speak?” when “who did you speak to?” reads more naturally in everyday writing.
Frequently Asked Questions
What is a preposition in simple terms?
A preposition is a word that shows the relationship between a noun and another word, usually involving time, place, or direction — like in, on, at, or with.
What are the three main types of prepositions?
Prepositions of time, place, and direction.
Is it wrong to end a sentence with a preposition?
No. That’s an outdated rule. Modern usage accepts it, especially in casual and conversational writing.
What is a prepositional phrase?
A prepositional phrase is a preposition plus its object and any modifiers, such as “under the bridge” or “with great care.”
What’s the difference between “between” and “among”?
Between is used for two items or people; among is used for three or more.
Quick Reference
- Preposition: a word showing the relationship between a noun and another word
- Time preposition: at, on, in, before, after
- Place preposition: in, on, at, under, between
- Direction preposition: to, toward, into, through
- Prepositional phrase: preposition + object + modifiers
Quick Practice
Three quick questions. See what stuck.
1. “The meeting is ___ 3pm.” Which preposition fits?
2. Which shows correct usage for two people?
3. Is it grammatically wrong to say “Who did you speak to?”