Be doing sth when..一系列“正在做.忽然做."哪个加动词原形?哪个通常用在过去完成时?为什么Be doing sth when..be about to do sth when..be on the point of doing sth when..had done sth when
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be doing sth.when
如何对be doing sth when造句
be on the point of doing sth.when...be on the point of doing sth.when...是固定句型,
be always doing sth .
be doing sth.
用 Sb who do sth be like sb else doing sth else who,when/once.造句
be worried doing sth 还是be worried about doing sth
when+doing 还是when+to do sth.
be worthy of sth / doing sth.
be worth sth./doing sth.造句,
there be sb/sth doing
be afraid of doing sth
be busy doing sth 例句
be interested in doing sth
be busy in doing sth
be long in doing sth
be behind in doing sth
be stop from doing sth