2016-06-23
xredued04
例如：
On Christmas Day
On the night of March 10
At+时间点
例如：
At 3 o′clock at the harvest time
固定词组
at night at last at first at once
at this time of the year at the beginning of
at the same time
注意：在表示时间里，下列情况下一般不用介词：
next/last/this/that/tomorrow/yesterday/one/every/all以及the day before yesterday和the day after tomorrow前不用介词。
例如：不能说in tomorrow 只能说tomorrow
(2)for+时间段
Since+过去的时间点/或者表示过去式的从句，这两种都表示“延续的一段时间”，常与完成时态连用。
例如：
He has lived here for ten years.
He has lived here since 1991.
He has lived here since he left school.
(3)在…之后
In+一段时间(用于一般将来时)
After+一段时间(用于一般过去时)
After+一点时间(常用于一般将来时)