英语状语从句讲解 课件-2023届中职高三英语一轮复习

英语语法一状语从句 什么是状语？ 状语是用于说明时间、地点、原因、目的、结果、条件 程度、方式和伴随状况等的一种句法成份。 Please come here in the evening.(时间状语) He is doing homework in his room.(地点状语) He speaks English very well.(程度状语) .I come here to see you.(日的状语) He was too excited,unable to say a word.(伴随状语) 什么是状语从句？ 用一个句子充当状语成分，那个句子就是状语从句。 当从句位于句首或者句中时，要用“，”隔开，放于句尾 时可以不用“，”隔开。 状语从句的类型 时间状语从句 地点状语从句 状语从句 目的状语从句 条件状语从句 结果状语从句 原因状语从句 方式状语从句 让步状语从句 比较状语从句 一、时间状语从句 一般由when,while,as,as soon as,before, after,since,till/until等引导。 主句用将来时，从句常用一般现在时表将来 I will tell him when he comes back. He left the room after he had finished his work. I will call you as soon as I get home. 1.when,while,as辨析 When既可以指一个时间点，也可以是一段时间， 可表示主从句的动作同时或先后发生。从句动 词可以是延续性的，也可以是非延续性的。 When I receive the letter,I'll tell you. (从句时间发生在前) When I got home,my mother was having dinner. (从句动作和主句同时发生。) Vhile引导的时间状语从句只指一段时间， 强调某一段时间内，主从句动作同时发生。 从句动词常是延续性的 While he was reading newspaper,his mother was cooking. While they were doing homework,someone broke into the house. As主要强调主句和从句的动作同时发生， 引导的动作一般是延续性的动作，常译成“ 一边..一边.”，有时也可译为“随着 We always sing as we walk. As we walked,we talked. As time goes by,the days become colder and colder. 另外： Vhile还可以表示“而，可是”，表示对比 I like reading while my wife enjoys watching TV. When还可以表示“就在那时”表示事情发生的很 突然 We were about to leave when it began to rain. 2.until/ti直到..才..，直到..为止 肯定式：延续的动词+until /till I waited for him until he came back. 否定式：非延续性动词+until（not..until) He didn't go to bed until he finished his work. 总结： 在肯定句中，til训和until一般可以互换，但untili可以 放在句首，t则不可以 Until then,I knew nothing at all about it. (在那以前，我对此一无所知。) 在否定句中，只有not..until结构 注意：not until 在句首时要倒装 .Not until he saw it himself did he believe it. 3.ass00nas表示“一..就.” I'll call you as soon as I get home. 4.since自..以来，自从。 表示从过去的一个时间起到目前为止，主句一般用现在 完成时，从句一般用一般过去时。 He has studied very hard since he came to our school.