We heard Tom sing an English song just now.改为被动

butonespring 1年前 已收到1个回答 举报

occw362vx23__cd 幼苗

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Tom was heard singing an English song just now (by us)

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butonespring 举报

为什么sing要加ing?

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因为变成被动语态后有be动词, 动词就要改为现在分词 (be doing)
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