while后面用什么时态

while后面用什么时态具体需要根据上下文和时态来定，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。

1.She likes to lie down for a while after lunch. 她喜欢午饭后躺一会儿。

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。

1.Some people waste food while others haven't enough. 有些人很费粮食，然而有些人却吃不饱。

2.The son was having a good meal at home，while the parents were working in the fields. 儿子在家吃好饭而父母却在田里辛勤劳作。

3.I ought to have helped her，but I never could. 我本该帮她但没能。

4.Honey is sweet，but the bee stings. 蜂蜜很甜，但蜜蜂有刺蜇人。

都译为“当…的时候”，区别为：when后的从句谓语动词既可是延续性动词，也可是短暂性动词，而且还可作并列连词，译为“这时”。但以下句型一定用when，作并列连词：

句型A：be about to 正要做……这时(发生另一事)

句型B：was/were 正在…这时(发生另一事)

句型C：had 刚要做……这时(发生另一事)