A preposition is a word placed before a noun or pronoun to form a phrase modifying another word in the sentence. Therefore a preposition is always part of a prepositional phrase. The prepositional phrase almost always functions as an adjective or as an adverb.

prepositions (2): after particular words and expressions
It is not always easy to know which preposition to use after a particular noun, verb or adjective. Here are some of the most common combinations...
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prepositions (3): before particular words and expressions
This is a list of a few expressions which often cause problems. For other preposition + noun combinations, see a good dictionary.at the cinema; at...
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prepositions (7): -ing forms and infinitives
Prepositions are not normally used before infinitives in English. After verb/ noun/adjective + preposition, we usually use the -ing form of a...
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abbreviated styles
Some styles of writing and speech have their own special grammar rules, often because of the need to save space or time.1 advertisements and...
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prepositions (1): introduction
meanings and use It is difficult to learn to use prepositions correctly in a foreign language. Most English prepositions have several different...
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