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.
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:
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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.
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2. |
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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.
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3.* |
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Use at in the fixed expression at night:
He works during the day and he attends
classes at night.
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4.* |
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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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