have to do是个固定短语,意思是不得不做,"做",即“do''是谓语动词,have to 做情态动词,do即谓语,“have to do”是“情态动词加谓语”的结构,而不单单是谓语,因为do的是homework,而不是"have to homework"由此可得,最后一句谓语动词是put.解释的雨点啰嗦,
关于have to do和谓语动词的辨析
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