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when加动词ing形式是什么意思

回答
瑞文问答

2021-09-06

是带连词when 的分词短语作状语。
如果与主语是主动关系 就用现在分词 如果是被动关系就用过去分词。
如:when getting off the bus ,you muat be careful.
when asked ,he said nothing.

扩展资料

  例句:

  When was the bridge constructed?

  那座桥是何时修建的?

  When did you get engaged ?

  你们什么时候订的婚?

  Until when can you stay?

  你可以待到什么时候?