as when while
①as意思是“当……时候,往往强调主句和从句中的动作或事件同时发生,有时译成“一边……一边。
②when 是普通用语,在表示“当……时候时,从句中既可用延续性动词,也可用短暂性动作的动词,可以替代as或while。
③while 引导的从句的动作常表示一段较长的时间或一个过程,常用进行时态,强调主句和从句的动作同时发生。注意:while从句中的动作一般是延续性动作的动词。
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