时间介词
Prepositions of Time
时间介词告诉我们事情何时发生。对具体时间和节日用 "at"，对日期和星期几用 "on"，对月份、年份、季节和较长时段用 "in"。记住：at night, on Monday, in the morning。
何时使用
时刻、餐点和节日用 "at"。星期几和具体日期用 "on"。月份、年份、季节、世纪和一天的时段（晚上除外）用 "in"。
结构
at + time / holidaysThe class starts at 9 o'clock. We eat at Christmas.
课**在**9点开始。我们**在**圣诞节吃饭。
on + day / dateThe party is on Saturday. Her birthday is on March 15th.
派对**在**星期六。她的生日**在**3月15号。
in + month / year / seasonShe was born in July. He graduated in 2020.
她**在**七月出生。他**在**2020年毕业。
信号词
- at
- on
- in
- during
- for
- since
- until
- by
例句
The meeting starts at 9 o'clock.
会议**在**9点开始。
Her birthday is on the 15th of March.
她的生日**在**3月15日。
We usually travel in the summer.
我们通常**在**夏天旅行。
I'll see you on Monday morning.
**星期一**早上见。
She has lived here since 2018.
她**自**2018年**以来**住在这里。
常见错误
I was born in 15th March.
I was born on 15th March.
具体日期用 "on"，不是 "in"
See you at Friday.
See you on Friday.
星期几用 "on"
提示
实用记忆法：把时间想成从小到大。"At" 最小（一刻/小时）、"on" 中等（一天）、"in" 最大（月、年或季节）。