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。
While用法
一、while作名词用,表示“一会儿”“一段时间”。
1.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。
推荐阅读:while后面用什么时态
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。
三、While作并列连词用,意思为“而,然而”,表对比。而but表转折。注意用心比较体会while与but的句中用意 。
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。
四、while,when,as的用法区别
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 do...when...正要做……这时(发生另一事)
句型B:was/were doing...when...正在…这时(发生另一事)
句型C:had done...when...刚要做……这时(发生另一事)
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