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【题目】Simon did his homework very carefully. (改为否定句)
Simon his homework very carefully.

【答案】didn't;do
【解析】句意:西蒙做作业很认真。句子的谓语动词是行为动词do 的过去时did ,含有行为动词的句子变否定句要用助动词do+not,过去时的句子要用助动词do 的过去式did+not,然后把原来的过去式改为动词原形,本句的动词是did, 原形是do。所以答案是didn't do 。

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