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B1 GRAMMAR · PREPOSITIONS · A2–B1
Prepositions of time: in, on, at
Small words with strict rules. For time, use “in” for long periods, “on” for days and dates, and “at” for clock times.
See the difference
A
in
months, years, long periods
We met in July.
我们在七月认识的。
B
on / at
on for days · at for clock times
The class starts at 9 on Monday.
课程周一 9 点开始。
Practise it
Q1 The meeting is ____ 3 o’clock.
Q2 My birthday is ____ September.
Q3 We travel ____ Friday.