Since引导时间状语从句（精编版）

1、since 引导时间状语从句(1 若 since 引导的状语从句的谓语动词是终止性动词 (如 go , come , leave , start , begin 等 的过去时 , 则从句表示的时间是 “ 从该动作开始的那一时刻起” 。 这是最常见的一种用法。如 :he has studied very hard since he came to our school. 自从来到我们学校 , 他学习就非常努力。great changes have taken place in our school since you left. 自从你离开这里 , 我们学校发生了很大的变化。(2 若 since

2、 引导的状语从句的谓语动词是持续性动词或表示状态的静态动词(如 live , stay , study , learn , smoke , be 等 的过去时 , 则从句表示的时间是“ 从该动作或状态的完成或结束时算起” 。如: i haven t heard from him since he lived here.这句话应译为 :从他不住这儿起 , 我一直没有收到他的信。i haven t eaten snakes since i was a student at school. was 表示状态 ,因此该句可理解为 :i haven t eaten snakes since i left

3、 school. 自从我毕业后就一直没吃过蛇。试比较 : he has written to me frequently since i was ill. 自从我病愈以来 , 他经常给我写信。 (从句谓语为状态动词he has written to me frequently since i fell ill. 自从我生病以来 , 他经常给我写信。 (从句谓语为终止性动词(3 若 since 引导的状语从句的谓语为持续性动词或静态动词的现在完成时, 则表示动作和状态延续到现在 (说话时刻 , 其表示的时间的起点应从动作发生之时算起。如 : he has written to me freque

4、ntly since i have been ill. 这里 have been ill表示状态的持续性 , 时间的起点应从 : “ 开始生病 ” 时算起。 因此此句可理解为 : “ 自从我生病以来 , 他经常给我写信。”试比较 : i ve written her 20 letters since i have been here. 自从我来到这 , 我已经给她写了 20封信。 (从开始算起i ve written her 20 letters since i was here.自从我离开这儿 , 我已经给她写了 20封信。 (从结束算起(4 it is + 段时间 + since. / i

5、t has been + 段时间 + since.表示 “ 从, 起已有 多长时间了 ” 。两句型意思相同 , 前者是规范说法 , 后者是口语说法。用法:since 从句中常用一般过去时 , 若从句中是持续性动词的一般过去时, 则 表示该动作结束有多长时间了。如: it is three years since he smoked. 他不吸烟已有 3年了。试比较 :it is three years since he began to smoke. it is three years since he has smoked. 两句均意为 :他吸烟已有 3年了。注意:在这种结构中 , since 引导的从句绝对不能用否定式的谓语动词来表示否定意义 , 试比较 :他好久没学汉语了。误:it is a long time since be didn t st