he is always complaining about.为啥子用complaining不用complains

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heisalwayscomplainingabout.为啥子用complaining不用complainsheisalwayscomplainingabout.为啥子用complaining不用com

he is always complaining about.为啥子用complaining不用complains
he is always complaining about.
为啥子用complaining不用complains

he is always complaining about.为啥子用complaining不用complains
complaining是动名词 complains动词 is是系词后面必须加动名词不能加动词