He does his homework at about six o'clock.(改成否定句)

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He does his homework at about six o'clock.(改成否定句)

He does his homework at about six o'clock.(改成否定句)
He does his homework at about six o'clock.(改成否定句)

He does his homework at about six o'clock.(改成否定句)
He doesn't do his homework at about six o'clock.

He doesn't do his homework at about six o'clock.

为什么是does而不是did.有个具体时间啊!

He doesn't do his homework at about six o'clock.谓语动词为实义动词,人称为第三人称单数,所以是在实义动词前加doesn't , 动词该为原形