while后面直接+doing,while后加动词ing为啥

while后面直接+doing,while后加动词ing为啥

可以的比如：While walking in the street, I heard a noise.如果while后面要接动词，则必须用doing,如果do while后面接句子或短语，则不用。其中while后面直接加动词时，动词形式一般要分为两种情况。1、如果该动词和主句主语之间为主动关系，则

＞▂＜ 1.名词或代词+doing sth 2. 名词或代词+to do 3.名词或代词+-ed 4.名词或代词+形容词短语515. while/when doing I like to listen to music while running. 我喜欢一边跑步，一边听音乐。16. have a good time/fun/problems/trouble/difficulty doing做某事有乐趣/问题/麻

1第1面：Whilewalkingthe dog ,you were careless ,it got lost and was hit by a car.其中的现在分词walking 与主意句的主语you 是主动的逻辑主谓关系——你need to do中不定式的逻辑主语就是主句的主语；need doing是主动形式表示被动含义，即need前的主语就是need后面的动词所表示的动作的承受者。注意：want和require作“需要”讲时，和n

while+doing Whilehewaseating,hewasaskedtolendme＄2.当他正在吃饭时，我请他借给我两美元。Whileeating,hewasaskedtolendme＄2.Whilehewasreading,hesang.他边吃边唱。Whwhile doing sth的意思是“当做某事的时候”，它是whle sb is/was doing sth的省略形式，这种省略原则上要求主句与从句的主语一致。如：He fell asleep while (he was) doing h