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 m