Grammar: Word classes: Prepositions

Indicating time (at)

Prepositions indicating 'time' tell us when something takes place:

When prepositions express 'time', they always work together with a noun group, forming a 'prepositional phrase':

Next year, Chinese New Year is in January.
We're going to the movies at four o'clock.
Mr Wing last saw Bozo Gong on Tuesday.

If you would like to practice choosing the correct prepositions to express time, click here: Try it out!

When choosing a preposition of time, we need to observe the difference between 'point in time' and 'extent in time' (also called duration):

Mrs Gong and the children went to the movies at five o'clock. [point in time]
Mrs Gong and the children were at the movies for three hours.
[extent in time / duration]

For more information on the distinction between 'point in time' and 'duration in time', see 

Grammar: Groups & phrases: Prepositional phrases: Expressing how / when / where / why: Expressing 'time' 

For a list of prepositions with meanings and examples, click on the menu on the left: 

Word classes: Prepositions: Preposition formation


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