8.动词(时态).pptVIP

时态难点讲解 一、若since引导的状语从句的谓语动词是终止性的过去时，则从句表示的时间是“从动作开始的那一时刻起”。如：He has studied very hard since he came to our school.自从他来到我们学校，他学习就非常努力。We have been missing them since they left here自从他们离开这里，我们就一直很想念他们。这是最常见的一种用法，此处不再多述。 二、若since引导的状语从句的谓语动词是持续性动词或表示状态的动词的过去时时，则从句表示的时间是“从那持续动作或状态结束时算起”。如：I haven’t heard any noise since I slept. Sleep 为持续性动词，sleep的动作结束时，即“醒来”时，这句应译为“我醒后还未听到任何声音”。John is now with his parents in New York, it is already three years since he was a teacher约翰现在和父母一起住在纽约，他不当教师已经三年了。 三、若since引导的状语从句的谓语为持续性动词的现在完成时，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：I haven’t heard from him since he has lived there。这里has lived表示动作的持续性，时间的起点应从：“开始居住”时算起。因此此句可理解为“自从他（开始）住在那儿起，我就一直没收到他的来信”。 He has never been to see me since I have been ill. 自从我生病以来，他从未来看过我。He has never been to see me since I was ill. 自从我病愈以来，他从未来看过我。由此可见，since引导的从句持续动词的一般过去时和现在完成时所表示的意思恰好相反。换言之，前者以肯定的语法形式反映着否定的逻辑内容，而后者的形式与内容是一致的。 B：一般现在时代替完成时： 句型 “It is … since…”代替“It has been … since …” It is +一段时间+since…的句型与It has been +一段时间+since…意思相同。前者是规范说法，后者是口语说法。 应注意的是，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，下面两句都错了：It is a long time since he didn’t study English.It’s two months since you didn’t come to see me.正确的说法为：It’s a long time since he studied English 他好久没学英语了。You haven’t come to see me for two months. 你有两个月没来看我了。 1、现在时态 Months ago we sailed ten thousand miles across this open sea, which ___ the Pacific, and we met no storms. A．was called ? B．is called? C．had been called ? D．has been called 2. I _____ ping-pong quite well, but I haven’t had time to play since the new year. A. will play B. have played C. played D. play B D 说明：本题的干扰源为上下文的过去时，但“被称为太平洋”是客观现状，只能用一般现在时。 说明：常识告诉我们，一个人一旦获得某种技能，一般是不会在短期内失去的，所以需用一般现在时。 3. Since I won the big prize, my telephone hasnt stopped ringing. People _____ to ask how I am going to spend the money. A. phone ? B. will phone ? C. were phoning D. are phoning 4. Selecting a mobile phone for personal use is no easy task because techn