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问题: 一道英语语法问题

but sometimes he still has some trouble speaking Chinese.
语法结构?speaking是动名词?是不是等于to speak Chinese.

解答:

在这个句子中实际是省略了trouble后面的介词in,have trouble (in) doing sth.这是固定的搭配,意思做某事有困难,故而此处的speaking并不等于to speak Chinese.