(a)
Please be on time in the future.
(b)
I usually listen music in the morning.
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In the past, in the present, in the future.
In the morning, in the afternoon, in the evening, in the night.
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(c)
We sleep at
night.
(d)
I fell asleep at
9:30.
(e)
She’s busy at
present. Please call again.
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At noon, at night, at midnight
At + “clock time”
At present, at the moment, at the present time.
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(f)
I was born in February.
(g)
I was born in 1990.
(h)
I was born in the twentieth century.
(i)
The weather is hot in (the) summer.
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In + a month/ a year/ a century/ a season
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(j)
I was born on October 21, 1995.
(k)
I want to a movie on Saturday.
(l)
I have class on Sunday morning(s)
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On + a date/ a weekday
On + weekday morning(s), afternoon(s),evening(s)
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