Prepositions

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A preposition is a word which shows the relation between a noun or a pronoun and some other word in a sentence. It is usually placed before the noun or pronoun whose relation it shows.

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A preposition is placed before the noun, pronoun, or other noun-like word, such as a gerund, whose relation it shows. Example: The cat is under the table.

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At usually denotes a definite point of time, and it can also be used for indefinite periods. Examples: at 3 o'clock, at midnight, at night, at Christmas, at Diwali.

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On is used with days and dates. Examples: on Monday, on 5th December, on the Diwali day, on Christmas eve, on the evening of 6th March.

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In is used with parts of the day, month, year, and season. Examples: in the morning, in the afternoon, in the evening, in March, in 2010, in summer, in winter. It is also used with the future tense to…

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In means at the end of a period. Within means before the end of a period. Example: I shall be back in a week means when a week is over. I shall be back within a week means before a week is over.

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By denotes the latest time at which an action will be over. Example: The show will be over by 6 p.m. It may finish earlier, but 6 p.m. is the latest time.

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From denotes the starting point of an action. It is almost always used with to or till/until. Example: The examination will be held from 8 a.m. to 11 a.m.