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A preposition is a word or phrase that introduces a noun, pronoun, adverb, or small group of words to modify some other word in the sentence. The preposition and the words, with which it combines, are known as a prepositional phrase.

  • If the prepositional phrase modifies a noun or a pronoun, it is called an adjective phrase.
  • If the preposition phrase modifies a verb, adjective, or adverb, it is called an adverb phrase.

A preposition always has an object.

The correct choice of preposition to use can sometimes be confusing to non-native English speakers. Consequently, sample sentences have been constructed to illustrate the correct use of various prepositions.

How to Use Prepositions (1)
How to Use Prepositions (2)

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