Prepositions are words or groups of words, that introduce phrases; and these phrases modify some element in a sentence. What follows a preposition is normally a noun, pronoun, or noun clause. A word that follows a preposition is its object, and, in the case of pronouns especially, this affects the form of the word.
- He walked near her (never He walked near she).
- He gave them to her and me (never He gave them to she and I or He gave them to her and I).
One of the problems in spotting prepositions in a sentence is that many of the words that are usually prepositions can also be used as adverbs.
- He never saw them before. (Here before is an adverb).
- They sat before the counter. (Here before is a preposition,and the whole prepositional phrase serves as an adverb, modifying sat).
source:http://babelnet.sbg.ac.at/themepark/grammar/preposition.htm
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