Preposition

A preposition describes a relationship between other words in a sentence. In itself, a word like "in" or "after" is rather meaningless and hard to define in mere words.

Consider the professor's desk and all the prepositional phrases we can use while talking about it. You can sit before the desk (or in front of the desk). The professor can sit on the desk (when he's being informal) or behind the desk, and then his feet are under the desk or beneath the desk. He can stand beside the desk (meaning next to the desk), before the desk, between the desk and you, or even on the desk (if he's really strange). If he's clumsy, he can bump into the desk or try to walk through the desk (and stuff would fall off the desk). Passing his hands over the desk or resting his elbows upon the desk, he often looks across the desk and speaks of the desk or concerning the desk as if there were nothing else like the desk. Because he thinks of nothing except the desk, sometimes you wonder about the desk, what's in the desk, what he paid for the desk, and if he could live without the desk. You can walk toward the desk, to the desk, around the desk, by the desk, and even past the desk while he sits at the desk or leans against the desk.

All of this happens, of course, in time: during the class, before the class, until the class, throughout the class, after the class, etc. And the professor can sit there in a bad mood [another adverbial construction].
 

List of common prepositions
 

about above across after against around at before behind below beneath beside besides between beyond

by down during except for from in inside into like near of off

on out outside over since through throughout till to toward under up upon with without

according to because of by way of in addition to in front of in place of in regard to in spite of instead of on account of out of

---

Is it any wonder that prepositions create such troubles for students for whom English is a second language? We say we are at the hospital to visit a friend who is in the hospital. We lie in bed but on the couch. We watch a film at the movies but on television. For native speakers, these little words present little difficulty, but try to learn another language, any other language, and you will quickly discover that prepositions are troublesome wherever you live. This page contains some interesting (sometimes troublesome) prepositions with brief usage notes.

 Prepositions of Time: at, on, and in
We use at to designate specific times.
The train is due at 12:15 p.m.

We use on to designate days and dates.
My brother is coming on Monday.
We're having a party on the Fourth of July.

We use in for nonspecific times during a day, a month, a season, or a year.
She likes to jog in the morning.
It's too cold in winter to run outside.
He started the job in 1971.
He's going to quit in August.

 Prepositions of Place: at, on, and in
We use at for specific addresses.
Grammar English lives at 55 Boretz Road in Durham.

We use on to designate names of streets, avenues, etc.
Her house is on Boretz Road.

And we use in for the names of land-areas (towns, counties, states, countries, and continents).
She lives in Durham.
Durham is in Windham County.
Windham County is in Connecticut.
 
 

Prepositions of Location: in, at, and on and No Preposition
IN (the) bed* the bedroom the car (the) class* the library* school*	AT class* home the library* the office school* work	ON the bed* the ceiling the floor the horse the plane the train	NO PREPOSITION downstairs downtown inside outside upstairs uptown