题目

since,for,during,in,at,on在时间上的用法区别
加时间段还是时间点,常用时态,表达含义,像什么on+具体时间,in+不确定的,at night\noon 就不要了
还有before，after后加时间的用法
不要简单地复制粘贴，先分分类
谢谢啦

提问时间：2020-08-07

答案

1、since作介词时,后接表示过去时间点的名词、代词、动名词；作连词时,后接一般过去时的从句；在含有since的句子,谓语动词用现在完成时.例：Since last seeing you ,I have been ill.
I have been studying English since I was four years old.对since的句子提问用how long.
2、for后跟时间段.例：He has been surfing the Internet for about 3 hours.
3、during后跟时间段.例：During the summer holidays we went swimming every day.
4、in后面跟时间段,并且是表示年,月.例：I won't do back to my home in a year.
5、at后跟时间点,比如六点钟：at six o'clock.
6、on是指具体到某一天,例：on August 19th在8月19日.