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想请教一下这个是什么用法呢?His fanther broke his leg when he climbed down

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想请教一下这个是什么用法呢?His fanther broke his leg when he climbed down the ladder.把这句话变成这样的句子His father broke his leg when climbing down the ladder.
想请教一下这个是什么用法呢?His fanther broke his leg when he climbed down
在状语从句中,当主句和从句主语一致,而且从句中含有系动词be,则从句中可以省略主语和系动词.如下面例句 I won't come to the party unless ( I am ) invited.