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?
问题描述：
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?
答
好好看看现在进行式是怎么用的。
答
do one's homework 是固定搭配
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,
答
这里的do是实义动词
They are not doing their homework.