He met many problems__he was going over his lessons 为何用while

He met many problems__he was going over his lessons 为何用while
while不是前后都要进行时么

rainsyr 1年前已收到3个回答举报

蓝吉儿布丁花朵

共回答了17个问题采纳率：82.4% 举报

He met many problems__he was going over his lessons
While 是后边必须是进行时,前边可以是,可以不是.如果前边的动作时短暂的就不用进行时.

1年前

贱气纵横八万里幼苗

共回答了7个问题举报

不是.表示一个动作发生时另一个动作正在进行用while.

1年前

StartKing 幼苗

共回答了75个问题举报

用when也是可以的

1年前

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你能帮帮他们吗

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