while后的句子时态可以是什么？
while后的句子时态可以是一般现在时，也可以是过去时态、进行时态等。
一、while作名词用，表示“一会儿”“一段时间”。
She likes to lie down for a while after lunch. 她喜欢午饭后躺一会儿。
二、While作连词
1、引导时间状语。
We must strike while the iron is hot.趁热打铁。
2、引起让步状语从句，意思是“虽然…但是….”、“尽管…但是…”(多放于句首)。
While he loves his students，he is very strict with them.虽然他爱他的学生，可是他对他们很严格。
3、引起条件状语，意思是“只要”。
While there is life there is hope.只要生命存在，就有希望。
词义辨析
when，while，as这些连词均可表示“当……时”引出时间从句。
when所引导的从句，其谓语动词既可是持续动词，也可是短暂动词；谓语动词动作发生的时间可以与主句谓语动词的动作是同时，或之前、之后。
while句中的谓语动词应为持续动词，不用短暂动词，谓语动作发生的时间通常与主句谓语动词动作发生时间是同时。
as侧重指从句与主句的动作同时进行，谓语动词可以是持续性的，可以是短暂性动词。
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