英语中的介词是个麻烦，特别是关于IN, ON, AT的表达，先上一张干货：
1)In:
It is used before the months（月）, years（年）, centuries （世纪）and seasons（季节）, times in the future（未来）.
The part of the day: Morning, afternoon, evening.
Month: January, February, March, April, May, June, July, August, September, October, November and December.
A season of the year: Summer, autum.
A specific year: 1985, 1965, 2004...
结构: in + (time).
例句:
She was born in March, 1967.
I was born in December.
See you in 5 minutes.
I usually work in the afternoon.
On 比较简单，所以用心记住三个例句就够了！
2)On:
It is used before the days of the week and dates（星期几和具体某日）.
Day of the week: Monday, tuesday, wednesday, thursday, friday, saturday, sunday.
Particular date: On 25th of July.
Calendar festival day: Christmas, halloween.
结构: On + (time).
例句:
I gave her a beautiful present on Christmas.
I go to school on Mondays.
Mary was born on January 7th 1989.
3)At:
It is used to indicate the time, holidays, parts of the day, etc.
Particular time: night, midday, noon, nine o'clock.
Particular time in a week / month / year: Start lend of the week / month / year.
Weekend meal: breakfast, lunch, dinner.
结构: At + (time).
例句:
I went to school at 8 o'clock.
I'm meeting Jack at 5 o'clock.
Kevin is going camping at the weekend.
We normally have lunch at midday.
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