Unit 9状语从句.ppt

The Adverbial Clause of Condition 由从属连词 unless 引导的条件状语从句 unless 引导的条件从句，在大多数情况下是含有否定意思，相当于 if…not 。 ( 2 ) unless : 除非；如果不 e.g. The baby will never cry unless he is hungry. 除非那婴儿饿了，不然他绝不会哭。 You will not pass the examination unless you study hard. 除非你努力用功，不然你不会通过考试。 The Adverbial Clause of Time ( 2 ) while 当……时候(= during the time that) e.g. 1. 当我妈妈做饭时， 我在看电视。 I was watching TV while my mother was cooking. 2. 当我看书时,我睡着了。 While I was reading, I fell asleep. 3. 当你吃饭时，你要好好的考虑一下。 You’ll think it over while you are having your lunch. The Adverbial Clause of Time ( 3 ) as 当……时候 ; 一边...一边, 随着 e.g. 当我出门时, 开始下雨了。 As I was going out, it began to rain. She sang as she worked. As she grew older, she became more beautiful. when, while, as ? 均可表示“当……时”,引出时间从句。 as → 侧重指从句与主句的动作同时进行，谓语动词可以是持续性的，可以是短暂性动词。 As I was going out, it began to rain. when → 所引导的从句，其谓语动词既可是持续动词，也可是短暂动词；谓语动词动作发生的时间可以与主句谓语动词的动作是同时，或之前、之后。while → 句中的谓语动词应为持续动词，不用短暂动词，谓语动作发生的时间通常与主句谓语动词动作发生时间是同时。 1. 他一边工作，一边唱歌。 　He sang as he worked. （Unit 4 PPT 56)当含有由before, after, as soon as等引导的复合句中，由于连词本身可以明确表示动作发生的顺序，故主句和从句一般都用一般过去时。 The Adverbial Clause of Time ( 6)( not ) till; until 直到……( 才；为止)=up to the time that Until可用于句首，而till通常不用于句首。 1)He will not go to bed until(till) his mother comes. 2)Until she told me, I had no idea of what they had said. 3)It is not until his mother comes home that he will go to bed.(强调结构） 1. 一直到你告诉我的时候,关于那件事我全然不知。 I had no idea of it until you told me. 2. 直到他回来，我才知道。 I didn’t know it until he came back. 3.他会一直等到我到达。 He will wait till ( until ) I arrive. 4. 坐在这里直到叫你（为止）。 Sit here ( till ) until you are called. Don’t leave ( till ) until you are called. The Adverbial Clause of Time ( 7 ) since 自从……以来 I haven’t seen him since he returned from Pairs. Since Tom was a child he has