A preposition of time is a preposition that allows or agree you to discuss a specific or particular time period such as a date on the calendar, one of the days of the week, or the actual time something takes place. Prepositions of time are the same words as prepositions of place, however they are used in a different way.
Use ago to talk about past times in reference to the current moment.
· I visited campus a few days ago.
Use by for one specific event that will happen before a certain time in the future. Use until for a continuous event that will continue and then stop at a certain time in the future.
Both during and while mean that something happens at the same time as something else.
Use during + noun.
Use while + subject + verb, or while + gerund.
We use from + to / till / until to define the beginning and end of a time period.
Use in for centuries, decades, years, seasons, and months:
We can use these prepositions with minutes in relation to the hour: