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高中英语知识点总结:since从句的用法

来源于网络  2013-05-21 17:20 】 【我要纠错
  1. Since从句为非延续性动词的过去时或现在完成时,时间的起点应该从从句动作完成时刻算起。   例如:   Things have changed a lot since I wrote to you last time.   自我上次给你写信之后,情况已发生了很大的变化。   She has lived with us since she has come here.   自从她来到这里,就一直和我们住在一起。   2. Since从句为延续性动词的一般过去时,表示动作或状态的结束。其含义与动词的词义恰好相反,具有否定意味。   例如:   All has changed since he was at home.   自从他离开家以后,这里的一切都变了。   I haven’t written to her since she lived in London.   自从离开伦敦以来,我还没有给她写过信。   He has never been to see me since I was ill.   自从我病愈以来,他一直没有来看我。   Two years have passed since I last smoked.   我戒烟已经两年了。   但如果since从句是延续性动词的现在完成时,则表示动作由开始延续至说话的时候,具有肯定意味。   例如:   He has never been to see me since I have been ill.   自从我生病以来,他一直没有来看我。   She has talked little since she has stayed at home.   自从她呆在家里以后,就很少讲话。   Since we have owned a car, we have gone camping every year.   自从我们有了汽车后,年年都去野营。   3. 在现代英语中,since从句是延续性动词的一般过去时,有时候也可以表示肯定意味。此时,多半用ever来加强since的语义。   例如:   She has known me ever since she was a child.   她从小就认识我了。   I have live here ever since I was born.   我生下来就住在这里。   4. 在it is+时间+since从句结构中,since从句是非延续性动词的一般过去时,含有肯定意味。   例如:   It is three years since her husband left her.   她丈夫离开她已经3年了。   It is over sixty years since the People’s Republic of China was established.   中华人民共和国已经成立60多年了。   5. 在it is+时间+since从句结构中,since从句是延续性动词的一般过去时,含有否定的意味。   例如:   It is three years since she stayed here.   她离开这里已经3年了。   How long is it since you were a league member?   你退团有多久了?   6. 在it is+时间+since从句结构中,since从句是现在完成时或过去完成时,均含有否定意味。   例如:   It is five years since we have seen her.   我们已经5年没有见她了。   It was years since I had seen her.   在那之前,我已经有好久没有见到她了。   It’s been a long time since I’ve seen you.   我已经很久没有见到你了。   另外,①根据英语惯用法,since从句不可以否定形式出现。   例如:   It is four years since I have smoked a cigarette. 我已经4年不抽烟了。   不可说:It is four years since I haven’t smoked a cigarette.   但由于下句中的since不作“自从”解,所以从句可以用否定形式。   例如:   I haven’t been out anywhere since I don’t know how long.   也不知多久了,我哪儿也没去过。   ②Since从句通常不与非延续性动词的现在完成时的肯定式连用。   例如:   Her mother died when she was a child.   她小时候母亲就去世了。   不可说:Her mother has died since she was a child.   ③Since前不可加表示时间的词语,但可以与ago连用。   例如:   She has lived with us since her mother died three years ago.   自从她母亲3年前去世,她就一直和我们住在一起。   不可说:She has lived with us three years since her mother died.   ④在It was five years ago since his father died. 一句中的since用错了,因为在含有ago的时间范畴里,已经有了从过去的一个时间点以来的时间,即已有了since的时间范畴,所以再用since是多余的。   改为:   It was five years ago that his father died.   他父亲5年前去世了。   It is five years since his father died.   他父亲去世已经5年了。

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