[高中英语知识点总结：since从句的用法.docxVIP

高中英语知识点总结：since从句的用法　　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