What is a Preposition? Definition, Examples, and How to Use Them

You probably use dozens of prepositions every day without even thinking about it — those tiny words like in, on, at, and for. They’re the quiet connectors that tell you where things are, when they happen, and how they relate to something else.

Number of prepositions in English: around 150 ·
Most common prepositions: in, on, at, for, by, with, to, from, of, about ·
Types of relationships expressed: time, place, direction, cause, manner ·
Percentage of preposition usage covered by top 20: approximately 90%

Four facts at a glance: a definition, the part-of-speech role, representative examples, and the approximate size of the preposition inventory.

What is a preposition and example?

What is a preposition in grammar?

• A preposition is a word that shows the relationship between a noun or pronoun and another word in a sentence (Grammarly (online writing assistant)).
• Prepositions commonly show location, time, direction, or manner (Merriam-Webster (authoritative dictionary)).
• They are a closed class — English does not easily create new prepositions (Grammar Monster (language education site)).

The pattern: prepositions turn vague ideas into specific pictures.

Definition of preposition with example

A preposition links a noun or pronoun to the rest of the sentence. In “The cat is in the box”, the preposition in shows where the cat is relative to the box (Twinkl (educational resource platform for teachers)). Other common examples: “The book is on the table” and “The dog is under the bed” (YouTube (educational video channel Scratch Garden)).

The pattern: the preposition comes before its object (the noun). That group of words is called a prepositional phrase. The implication: every time you say “on the table” or “under the bed,” you’re using a preposition to create a clear mental picture.

How do you explain prepositions to kids?

Simple definition for kids

• Prepositions are “linking words” that connect one part of a sentence to another (Grammar Monster (language education site)).
• They help answer “where?” and “when?” — like in, on, under, before, after (Twinkl (educational resource platform)).
• Use physical objects: put a toy under a chair and say “The toy is under the chair.” Repeat with over, beside, and behind (YouTube (educational channel Scratch Garden)).

Fun activities to teach prepositions

Games like preposition scavenger hunts — ask “Find something under the desk” — turn grammar into movement. Drawing prompts also work: “Draw a cat between two dogs.” The child sees the spatial relationship directly.

The catch: English prepositions don’t always match the child’s native language patterns, so repetition with real objects works best.

What are the 20 most common prepositions?

List of common prepositions

Twenty prepositions account for the vast majority of everyday usage (PrepScholar (test-prep resource)). Here they are grouped by the kind of relationship they typically show.

• Place/location: in, on, at, above, below, between, among, within, behind, beside
• Time: before, after, during, until, since, within
• Direction/movement: to, from, through, across, along, into, over, under
• Other relationships: of, for, by, with, about, without

Many classroom resources list about 30 common prepositions.

Examples of each preposition in a sentence

The pattern: the same preposition can appear in multiple categories. “In” can mean place (in the room) or time (in ten minutes). Context decides.

How can I identify prepositions in a sentence?

Steps to find prepositions

1. Look for small words that come before a noun or pronoun — in, on, at, for, by, to, from are the most common (Grammarly (online writing assistant)).
2. Ask “where?” or “when?” — if the answer includes the word, it’s likely a preposition (Merriam-Webster (authoritative dictionary)).
3. Check if the word is followed by an object (a noun or pronoun). If so, it’s a preposition; if not, it might be an adverb.

Prepositional phrase identification

Once you spot a preposition, its object follows. Together they form a prepositional phrase. In “She walked through the tunnel,” the phrase through the tunnel tells where she walked (YouTube (educational channel Scratch Garden)).

The phrase can act as an adjective (modifying a noun: “the cat under the table“) or an adverb (modifying a verb: “ran into the room“).

What this means: with a two-question test (where? when?) and an object check, you can catch prepositions in any sentence.

What is a preposition phrase?

Structure of a prepositional phrase

• A prepositional phrase begins with a preposition and ends with a noun or pronoun (the object) (Walden University Academic Skills Center (university writing support)).
• Optional: words can appear between the preposition and its object (e.g., “in the big red box”).
• The object cannot be a verb in base form — it’s always a noun or pronoun.

Examples of prepositional phrases

A few phrases show the range: “under the bed,” “through the forest,” “according to the rules,” “in front of the school.”

These phrases function as a single unit. In “The house on the corner is blue,” the phrase on the corner describes which house.

The trade-off: mastering prepositional phrases unlocks complex sentence structures — you can write “The man with the hat walked into the store after lunch” and keep it clear.

Summary

Prepositions are small but indispensable: they anchor nouns in space, time, and relationship. For anyone learning English — whether child or adult — the path is clear: start with the top 20 prepositions, practice the “where? when?” test, and build prepositional phrases step by step. For a teacher in a classroom, the choice is practical: use physical objects and scavenger hunts, because a child who can say “the toy under the chair” is well on the way to writing clear, connected sentences.

Frequently asked questions

Related reading

• 6 Letter Word Finder – a tool for word games that can help reinforce spelling and vocabulary.
• What Is a VPS Server – Comprehensive Beginner’s Guide – another explainer that follows the same step-by-step teaching approach.

“A preposition is a word that shows direction, location, or time.”

— Merriam-Webster (authoritative dictionary)

“Prepositions show the relationship between a noun and something else in a sentence.”

— BBC Bitesize (educational broadcaster)

“A preposition is a grammatical term for a word that shows a relationship between items in a sentence.”

— Walden University Academic Skills Center (university writing support)