介词
一． 表示时间的介词：
a. at, on, in
1. at 表示在某一时刻，某一时点，几岁
I get up at 6:00 every day.
She got the job at the age of 23.
At dawn/sunrise/noon/sunset/night/midnight/once/present/Christmas/New Year
2. on表示在具体某一天或某天的上下午
National Day is on the first day of October.
She will visit her uncle on Monday.
3. In表示在较长的一段时间，如：世纪，朝代，时代，年，季节，月，以及泛指的上午，下午，晚上。
In the morning/afternoon/evening
I often go swimming in summer.
In one’s childhood/ in one’s twenties/ in the meantime/ in the end/ in the future/ in one’s old age/ in one’s youth
b. Before, after
Wash your hands before dinner.
New Year comes after Christmas.
P.S.: 在this, last, next, every等词前面一般不加介词
This evening/ last Friday/ every Monday/ next Sunday
c. Since, till
Since 表示自从…以来，till表示直到…为止
We have lived here since 2014.
He waited till midnight yesterday.
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