16.Tina is playing the piano now.(改為否定句)
Tinaisn't playing the piano now.

分析 緹娜正在彈鋼琴.
緹娜現(xiàn)在不在彈鋼琴.

解答 答案:isn't.原句含有be動(dòng)詞,否定句在后面加上not,故答案是isn't.

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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