深圳电大 23-24状语从句.ppt

Unit 23 Adverbial clauses Aims Understand what an adverbial clause is Use different types of adverbial clauses to express different meanings. Tell apart adverbial clauses of time, reason, purpose, condition, result, manner, place and concession. 在复合句中作状语的从句,叫做状语从句 复合句包括主句和从句。 从句是对主句意思的补充说明 类型 时间状语从句 原因状语从句 条件状语从句 目的状语从句 时间状语从句 内容要点： when, as, while whenever, every time, each time 任何时候;每当 since(自从，从...以来),ever since(从那时起一直到现在;此后一直) before(在...之前),after(在...之后) till, until as soon as, immediately, directly, once, the minute/moment (that) etc. no sooner...than, hardly (scarcely)...when 时间状语从句 一.引导时间状语从句的从属连词 常见的有before, after, when, while, as, since, till, until, as soon as ,whenever. Things were different when I was a child. It’s a long time since I met you last time. He waited until she was about to leave. when, as, while when引出的时间状语从句，其中的动词既可以是延续性动作的动词，也可以是瞬间性动作的动词，而且可以表示主语的动作和从句的动作同时发生，或者从句的动作发生在主句的动作之前. When the students heard the teachers footsteps, they all stopped talking. as引出的时间状语从句，其动作是延续性的，而且侧重表示主句和从句的动作同时发生. As the students walked to their dormitories, they sang happily. while表示在某一段时间里或在...期间,其所引出的从句的动作是延续性的，且侧重表示主句和从句的动作同时发生. While the teacher paraphrased the text in English, the students listened attentively and took notes. whenever, every time, each time 任何时候;每当 Whenever I met her, she was studying. Every time I met her, she was staying with him. Each time I met her, she was listening to the music. 涉及time的几个从属连词 every time每次, each time每次, any time随时; (the) next time下次; (the) last time上次; the first time第一次 He didn’t tell me last time I saw him. since(自从，从...以来),ever since(从那时起一直到现在;此后一直) since, ever since引导的从句通常用一般过去时,主句中的谓语动词通常用完成时. e.g. Weve never met since we graduated from the college. till, until until比较正式，可用于句首,而till一般不用于句首.till和until所表示的意义相同，但要注意以下情况: 如主句的谓语动词是延续性动词,就常用肯定式表示直到...为止 He will remain in college until (till) he finishes his Ph.D course. 如主句的谓语动词是非延续性动词,就常用否定式表示直到...才或在...之前(不).此时的till和still可