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Prepositions: Using "At" for Time, by Dennis Oliver

Prepositions #3:
Using At for Time


The preposition at is also common in time phrases.
When at is used in this way, it is followed by noun
phrases that show a specific clock time.


I'll see you at 9:30.

I'm going to leave at noon.

His flight is at 3:20 PM.

He stopped studying at midnight.

The class ends at half past three.

She arrived at ten minutes before eleven.


Special Notes:


Do not use at with calendar times:

wrong: *U.S. Independence Day
is at July.

wrong: *U.S. Independence Day
is at July 4th.

wrong: *She always has a party
at her birthday.


Do not use at with most* non-specific
clock times.

wrong: *My appointment is at
the morning.

wrong: *I'll see you at the evening.


Use at in the fixed expression at night:

He works during the day and he attends
classes at night.


Also use at in the fixed expressions
at once ("immediately") and at times
("sometimes" / "occasionally"):

Come here at once!

At times, I don't want to get up and
go to work.

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