i do not know .谁是动词?he is walking .i look at him .

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i do not know .谁是动词?he is walking .i look at him .
i do not know .谁是动词?he is walking .i look at him .

i do not know .谁是动词?he is walking .i look at him .
i do not know (do是助动词,know是动词)
he is walking .(He是主语,is是be动词,walking是动词)
i look at him .(look是动词)

do 是助动词 know walk look是实义动词

do是助动词;know是行为动词;is是be动词;walk是行为动词;look是行为动词。

know
walk
look