since,for,during,in,at,on在时间上的用法区别

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.