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"A preposition of time used to indicate when a particular action takes place."
A preposition of time allows you to discuss a specific time period such as a date on the calendar, one of the days of the week, or the actual time something takes place..
The most common prepositions of time are at, in, by, for, since and on.
Preposition of time word 'At' is used with a definite point of time. This preposition of time is used to discuss clock times, holidays and festivals, and other very specific time frames.
Preposition of time word ‘In’ is used for months, years, decades, centuries, and long periods of time. This preposition of time is used to discuss months, seasons, years, centuries, general times of day, and longer periods of time.
Preposition of time word ‘By’ refers to latest time by which an action will be completed.
Preposition of time word 'For' denotes a period of time and is used with the perfect continuous tense.
Preposition of time word 'Since' denotes a certain point of time (past till now) and is used with the perfect continuous tense.
Preposition of time word 'On' is used with Days / Dates. This preposition of time is used to discuss certain days of the week or portions of days of the week, specific dates, and special days.