since和for的区别?

问题描述:

since和for的区别?

在现在完成时的句子中,since后面接过去的某一具体时间点,“since+过去的时间点”表示从这一时间点到现在的一段时间.
这一时间点如果用时间状语从句来表示,这一从句的谓语要用短暂性动词,并且要用一般过去时.
如:
I have seen a lot of friendly people since 1980/since I came to China/ since10 months ago/since I moved to the city in 2006.
for直接接一段时间.如:
I've been in China for 5 years/for 8 weeks/for a long time.