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For 与sinCE持续动词

for+一段时间since+点的时间FOR EXAMPLE:for 5 years(是一段时间)since 2005(是一个时间点)有不理解欢迎追问~

1. for和since引导短语/从句在句中做时间状语时,如果该句是肯定句,则要求句子谓语动词是延续性动词.但是如果句子为否定句,则无此要求.如:I have lived here for 3 years.= I have lived here since 3 years ago.I haven't seen you for a long

It's years since I smoked 我戒烟好纪念了. It's years since I left here .我离开这好多年了. smoke类的动词和since 连用表相反意思,而leave类 恰好相反.

现在完成时中可以用for, since,而且很常用:I have studied English since 3 years ago.I have studied English for 3 years.2. for, since可以与延续性动词连用:I have kept the book for 4 days.I have kept the book since 4 days ago.3. 延续性动词能再现在完成时用,就比如 I have kept the book since 4 days ago.

for指一段时间,如:一年;since指自从某某时刻开始

for: (prep) 表示时间的持续,后面加时间段,表示一段时间,多与带数词的名词连用,其谓语需用延续性动词. We have been leaning English for two years. since: (prep) 表示“自从过去某一时间点以来”,后面接点时间,强调动作或状态一直延

since+时间点 for+时间段 Since 用来说明动作起始时间,for用来说明动作延续时间长度. 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.但如果只了解词的含义,而不了解其用法,在使用时就会造成错误.例如

since和for引导的时间状语基本都是一段时间.不能用瞬间动词.

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.

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