for+一段时间是完成时,那for+点时间是什么时态呀
for通常可以接一段时间,而不能接点时间。
常和现在完成时连用,有时也可以和一般将来时、一般过去时连用。since后面才可以接点时间,如:
I have learned English for one score years.
I haven't seen you for ages.
He has studied Chinese for thirteen years.
He has played the piano for two hours.
扩展资料
for、since、from、ago、before表示时间的区别和用法如下:
1、since和from表示“时间点之后”,ago和before表示“时间点之前”。
2、for表示“持续多长时间”,后面跟时间段。
I once studied the guitar for three years. 我曾经学了3年吉他。
That house has been emptied for six weeks. 那间房子已经空了6个星期。
(1)、for表示“持续到现在的一段时间”,用现在完成时(have+过去式)。
I've known her for a long time. 我知道她已经很长一段时间了。
(2)、for用现在进行时,表示将来。
How long are you staying? 你将呆多久?
3、from和since后面都跟时间点,根据句中时态不同,表示“某事现在或过去开始的时刻”。
I'll be here from three o'clock onwards. 我将从3点钟开始呆在这里。
I've been waiting since ten o'clock. 我从10点钟开始一直在这里等。
since用在“从时间点开始的行动或状况一直持续到现在”的句中,from用在“开启某一行动或状况的时间”。
4、for和since都可用在现在完成时态中(have+过去式),但有区别。
1)、for+时间段。
I've known her for three days. 我已经知道她3天了。
I've been here for a month. 我已经在这里一个月了。
2)、since+开始的时间点。
I've known her since Tuesday. 我星期二就已经知道她了。
I've been here since July. 我从7月份开始就在这里了。
参考资料来源:百度百科-for
参考资料来源:百度百科-since
I have learned English for one score years.
I haven't seen you for ages.
He has studied Chinese for thirteen years.
He has played the piano for two hours.
希望我能帮助你解疑释惑。
那怎么判断for+一段时间是用完成时态还是用别的时态
看整句话要表达的事情是在何时发生。如果是从过去持续到现在,就用现在完成时,如果只是在过去的某段时间内发生,和现在毫无联系,用过去时,如果在说话之后发生,则用一般将来时,还有,如果主语是过世的人,如Lei Feng、Mao Zedong、Leornado da Vinci等,也用一般过去时,如:
He worked in New York for three years. (现在不在纽约工作)
He has worked in New York for three years. (现在在纽约工作)
Mao Zedong lived there for one year. (主语表示的是过世的人)
I will stay here for two weeks. (我要在这里呆两个星期,动作在说话之后发生)
希望我能帮助你解疑释惑。
现在完成时态 since 和for