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For 和sinCE的区别

1,Since +时间点,具体时间 “自从、、、以来,从、、、以后” 用来说明动作起始时间 例句:I have been in Beijing since 2010.2,For + 时间段,用来说明动作延续时间长度,因此句中的谓语动词,也应该是延续性动词.例句:I have been here for 3 days. (对)I have arrived here for 3 days.(误)

since的用法主要有两点:一是表示“自从……以来”,二是表示“既然”之意. For:一、用作介词 1. 表对象,意为“为;给;对”. I want to get some food for supper this evening. 2. 表用途,意为“适于;适合”. It's a fine day for a walk. 3. 表原因、理由,意为“为了,因为”.

1、用法不同.这两个词都可以和表示时间的词语连用.一般说来,for后接一段时间(累计时间),用以说明某事一直进行了多长时间;而since后接某一时间(过去的一个时间点),用以表示某件事开始的时间.2、语气不同.since和for均含有

Since 用来说明动作起始时间,for用来说明动作延续时间长度. I have lived here for more than twenty years. I have lived here since I was born.. My aunt has worked in a clinic since 1949. Some new oilfields have been opened up since 1976. I

since 后跟时间点;for 后跟时间段,如:I've been learning English since six years ago.I've been learning English for six years.希望对你有帮助

for指一段时间,如:一年;since指自从某某时刻开始

for和since 都可用于完成时态.区别:for 后接时间段,如 for 2 years; since后接时间点,如 since 2 years ago

延续性动词表示能够延续的动作:It is five days since he came here、延续性动词的用法特征 1. 正,这种动作可以延续下去或产生持久影响;的短语有、若since引导的状语从句的谓语动词是终止性的过去时,sleep的动作结束时. 误,不能持续.

since+时间点 for+时间段 eg:He has kept the book for two weeks. He borrowed the book since two weeks ago.注意动词的时态,for后面是一段时间,动词用完成式,而since后面是一个时间点,动词用过去式.两周前的一天,与for two weeks的两个星期这样14天相比是一个点.这个我以前的老师教我们可以联系数学,for后面是一个线段(或数轴),而since后面是线段上的一个点,或者是数轴上的点,这样理解就方便多了.你可以试试看.

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.

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