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8．I did my homework at home yesterday．（改為否定句） Ididn't domy homework at home yesterday．

分析我昨天在家做作業．
我昨天沒有在家做作業．

解答答案：didn't do．這里是一般過去時，借助于did構成否定，后加動詞原形do，故答案是didn't do．

點評含有be動詞，情態動詞或者助動詞have/has的句子轉化成否定時在其后面加上not，一般實意動詞的否定式，通常應根據不同時態和人稱在實意動詞之前加don't，doesn't，didn't等．

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