Prepositions are used to link nouns and pronouns to other words within a sentence. The words linked to are called objects.

Usually prepositions show a spatial or temporal relationship between the noun and the object, like in the example below:

The cat is under the table.

Cat is the noun. Under is the preposition. Table is the object.

Here is a list with the most common prepositions: about, above, after, among, around, along, at, before, behind, beneath, beside, between, by, down, from, in, into, like, near, of, off, on, out, over, through, to, up, upon, under, and with.

Notice that you can also have a prepositional phrase, which is formed by the preposition and its object. A preposition phrase can function as adverb, adjective or noun. For example:

The dog was running under the rain.

The prepositional phrase “under the rain” acts as an adverb, specifying where the dog was running.