18．Mark is watching TV now．（改為否定句）
Markisn'twatchingTV now．

分析 馬克現(xiàn)在正在看電視．
馬克現(xiàn)在沒(méi)有在看電視．

解答 答案：isn't watching．原句是現(xiàn)在進(jìn)行時(shí)，含有be動(dòng)詞is，改為否定句的時(shí)候在后面加上not，縮寫成isn't，故答案是isn't watching．

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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