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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(yè)．
我昨天沒(méi)有在家做作業(yè)．

解答答案：didn't do．這里是一般過(guò)去時(shí)，借助于did構(gòu)成否定，后加動(dòng)詞原形do，故答案是didn't do．

點(diǎn)評(píng) 含有be動(dòng)詞，情態(tài)動(dòng)詞或者助動(dòng)詞have/has的句子轉(zhuǎn)化成否定時(shí)在其后面加上not，一般實(shí)意動(dòng)詞的否定式，通常應(yīng)根據(jù)不同時(shí)態(tài)和人稱在實(shí)意動(dòng)詞之前加don't，doesn't，didn't等．

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