That boy is always making trouble for the rest of the class.为什么always后要用making,而不用make.

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That boy is always making trouble for the rest of the class.为什么always后要用making,而不用make.
That boy is always making trouble for the rest of the class.
为什么always后要用making,而不用make.

That boy is always making trouble for the rest of the class.为什么always后要用making,而不用make.
is doing 这里用现在进行时表示习惯进行:表示长期的或重复性的动作,说话时动作未必正在进行.
前面有了is 怎么能用make呢..

be + doing
原句:the boy IS (always) MAKING ....