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they do not doing their homework为什么不对呀?
我看新概念上面说是 they are not ding their homework.
不是说BE动词后面不能跟动词吗?DO不是动词吗?
人气：450 ℃ 时间：2019-12-01 05:39:38
解答
这句话是现在进行时态,表示现在正在进行的动作.
doing在这里是do的现在分词,
而不是动名词,
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