unit 5 状语从句讲解教学.ppt

用作状语的从句叫做状语从句。引导状语从句的关联词是一些从属连词。 When you cross the road, you must be careful. 当你过马路时要小心。（when是从属连词） I was late because I missed the bus. 我迟到了，因为我错过了公共汽车。 （ because是从属连词） If she asks me, I’ll tell her. 她如果问我，我就告诉她。（if是从属连词） You look as if you need a rest. 你看起来好像是需要休息。（as if是从属连词） 状语从句的种类 1、时间状语从句 when, while, as soon as, since, until, before, after 2、条件状语从句 if;unless; as long as 3、原因状语从句 because;since ;as 4、目的状语从句 so that ; in order that 5、结果状语从句 so/such…that 6、让步状语从句 although, though 7、比较状语从句 than;as…as; not as/so…as 1. 时间状语从句 引导时间状语从句的关联词常有：after, before, when, while,as soon as, as, since, until 等。 e.g. 我吃完午饭后就去上学。 I went to school after I had my lunch. e.g. 他睡觉之前要先刷牙。 He brushed his teeth before he went to bed. e.g. 等他回来吧。 Wait?until?he?comes?back.? e.g. 他来时，我在做饭。 When he came, I was cooking. e.g. 我一回来就给你打电话。 I’ll call you as soon as I come back. e.g. 他们回来前，我们已经完成工作了。 Before they came back, we had finished the work. e.g. 自从他离开后我们没见过面。 We haven’t seen each other since he left. while / when 辨析 when/while+doing e.g. When/while reading,he fell asleep. when+短暂性/延续性动词；while+延续性动词 e.g. 当老师进来时，我正在睡觉。 When the teacher came in,I was sleeping. =While /When I was sleeping, the teacher came in. when (就在这时) e.g. 我正在睡觉，就在这时有人敲门了。 I was sleeping, when someone knocked at the door. while 的其他含义： While I was walking down the street, I came across an old friend. ( while =_______) He likes pop music, while I am fond of folk music. ( while =_______) While I really don’t like art, I find his work impressive. (while=_________) While there is life there is hope. (while=___________) when although as long as but 只要有生命在，就有希望。（一息若存，希望不灭） ★ as 的常见用法： 1. She sang as she worked. 一边……一边…… 2. You must try to do as I did. 像…..一样 3. As she was late for class, she had to say sorry. 由于 注意：在时间状语从句里，通常不用将来时态，用现在时态表示将来的动作或状态。“主将从现”