1、时间状语从句 A. when, while, as, whenever; when, while, as 表示主句谓语作和从句的谓语动作同时发生或几乎同时发生。 1.when ①when 表示点时间时,从句中用短暂性动词;表示段时间时,用持续性动词。 When I got home, my family were already having dinner.我到家的时候,全家已在吃晚饭。 (when 表示点时间) When they were still talking and laughing, the teacher came in. 当他们还在说笑的时候,老师进来了。(when 表示段时间) He waved hello when he saw her. 当他看见她的时候,就挥手打了个招呼。(when表示点时间) When you think you know nothing, you begin to know something.当你认为自己一无所知的时候,就开始知道一些事情了。(when 表示段时间) 【注意】当 when 意思是正当……时候(and at that moment )时,when 只能跟在前一分句之后。 He was about to go to bed when the doorbel rang. 他正要上床,忽然门铃响了。 They were watching the World Cup when suddenly the lights went out. 他们正看着世界杯比赛,突然灯灭了。 They had just arrived home when it began to rain. 他们刚到家,天就开始下雨了。 ②有时 when 表示虽然,尽管的含义,相当于 although 或 since。 He walks when he might take a taxi. 尽管可以打的,但他还是步行。 How can you hope for mercy yourself when you show none 既然你不宽恕别人,你自己又怎能希望得到别人的宽恕呢? 2.while ①while 通常表示一段时间,从句中宜用持续性动词作谓语。 Strike while the iron is hot.趁热打铁。 She fell asleep while she was reading the newspaper. 她在看报的时候睡着了。 ②while 有时可以作并列连词,表示对比,可译成……而……。 I am fond of English while he likes math. 我喜欢英语而他却喜欢数学。 We slept while the captain kept watch. 我们睡觉而上尉担任警戒。 ③while 有时可引导让步状语从句,意思是虽然。 While they love the children, they are strict with them. 虽然他们都爱他们的孩子,但却对他们要求严格。 虽然 during 与 while 意思很相近,但是 during 是介词,不能引导从句。 3.as...