Not "Class starts in 7 o'clock." — say "Class starts at 7 o'clock.". A clock time takes at, not "in".
Try it: Amina wakes up ___ 6 o'clock. (at / in / on) Answer: at — A clock time takes at: at 6 o'clock. "in" is for longer periods like months.
on = a day or date
Learn this pairing: on + a day or a date.
We have class on Monday.
Amina arrives on May 15th.
The party is on Saturday.
Not "We have class in Monday." — say "We have class on Monday.". A day takes on, not "in".
Try it: We have class ___ Monday. (on / in / at) Answer: on — A day of the week takes on: on Monday. "in" is for months and longer periods.
in = a month, year, or season
Learn this pairing: in + a longer time, like a month, a year, or a season.
Amina's birthday is in May.
The school opened in 2024.
It's cold in winter.
Not "Amina's birthday is at May." — say "Amina's birthday is in May.". A longer time like a month takes in, not "at".
Try it: Amina's birthday is ___ May. (in / at / on) Answer: in — A month takes in: in May. "at" is for a clock time, not a month.
Try it: The party is ___ Saturday. (on / in / at) Answer: on — Saturday is a day, so it takes on: on Saturday. "in" is for months; "at" is for clock times.
in the morning, but at night
Learn these: in the morning / afternoon / evening, but at night.
Amina studies in the morning.
We have class in the afternoon.
Hiroshi reads at night.
Not "Hiroshi reads in night." — say "Hiroshi reads at night.". We say in the morning / afternoon / evening, but for night we say at night.
Try it: Hiroshi reads ___ night. (at / in / on) Answer: at — Night is the odd one out, it takes at: at night. It's "in the morning" but "at night," not "in night."
Try it: Class starts ___ 8 o'clock. (at / on / in) Answer: at — A clock time takes at: at 8 o'clock. "on" is for days; "in" is for months.