while后面一定要接doing吗?

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while后面一定要接doing吗?
while后面一定要接doing吗?

while后面一定要接doing吗?
不是的,
while可以表示时间段例：
My Dad fell asleep while he was watching TV.我爸爸在看电视时睡着了.
while 做连词时可表示转折.
Some people are rich while others are poor.有的人富,而有的人穷.
注意：★while做连词时,要注意前后并列,

不一定.while还表示在...期间

不一定.也可以跟从句.
He was talking on the phone while we were watching TV.
He was singing while taking a shower.

表时间解时要用进行时或加表时间的词组
如：I was watching TV while he was washing the clothes.
He had already come back while it was not dark yet.
表示比较时(即与whereas同意）直接加从句即可:
如：Russia is the biggest nation by area while Vatican is the smallest state.

应该说是的

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