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1、模块同步语法,when表示“当的时候”。从句中既可用延续性动词,又可用非延续性动词,这些动词既可表示动作,又可表示状态。从句中的动作既可和主句的动作同时发生,又可在主句的动作之前或之后发生。eg:Mary was having dinner when I saw her.我看到她的时候,玛丽正在吃晚餐。The boy was still sleeping when his mother got home yesterday morning.当他母亲昨天早上回家的时候,男孩仍在睡觉。,while表示“在的时候”、“在期间”、“一边一边”。while从句中必须是表示动作或状态的延续性动词。它强调主
2、句的动作与从句的动作同时发生或主句的动作发生在从句的动作过程中。eg:The weather was fine while we were in Beijing.我们在北京期间,天气很好。She called while I was out.我在外面时,她打来电话。如果主句的动作在从句的动作过程中发生,从句常用进行时。,eg:While we were swimming,someone stole our clothes.当我们正在游泳时,有人偷了我们的衣服。Dont talk so loudly while others are working.其他人在工作的时候,不要大声说话。有时when和while可以互换使用。eg:The alien got in when/while the girl was watching TV.当女孩正在看电视时,外星人进来了。,