【題目】Simon did his homework very carefully． (改為否定句)
Simon his homework very carefully．

【答案】didn't；do
【解析】句意：西蒙做作業(yè)很認(rèn)真。句子的謂語(yǔ)動(dòng)詞是行為動(dòng)詞do 的過(guò)去時(shí)did ,含有行為動(dòng)詞的句子變否定句要用助動(dòng)詞do+not,過(guò)去時(shí)的句子要用助動(dòng)詞do 的過(guò)去式did+not,然后把原來(lái)的過(guò)去式改為動(dòng)詞原形，本句的動(dòng)詞是did, 原形是do。所以答案是didn't do 。

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