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Prepositions: Prepositions: Using "At" for Time

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 specific clock time.

Examples:

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.


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Special Notes:

1.

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.

2.

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.

3.*

Use at in the fixed expression at night:

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

4.*

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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