【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)很認真。句子的謂語動詞是行為動詞do 的過去時did ,含有行為動詞的句子變否定句要用助動詞do+not,過去時的句子要用助動詞do 的過去式did+not,然后把原來的過去式改為動詞原形，本句的動詞是did, 原形是do。所以答案是didn't do 。

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