while后的句子谓语动词并不一定是ing形式，具体形式需要根据上下文内容和时态来判定。while后的句子时态可以是一般现在时态，也可以是过去时态、进行时态等。
while的具体用法如下：
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。
2.Coming to another country to study requires a big adjustment and it takes awhileto fit in.来到另一个国家求学，需要花一段时间来适应。
二、While作连词。
1.引导时间状语(从句动作必须是延续性的)。
(1)We must strike while the iron is hot.趁热打铁。
(2)While she was listening to the radio,she fell asleep.她听着收音机睡着了。
2.引导让步状语从句，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.引导条件状语,意思是“只要，如果”。
(1)While there is life there is hope.只要生命存在,就有希望。
(2)While there is away there is away.有志者事竟成。
三、While作并列连词，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。
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