题目内容
16．Tina is playing the piano now．（改为否定句）Tinaisn't playing the piano now．
分析 缇娜正在弹钢琴．
缇娜现在不在弹钢琴．
解答 答案：isn't．原句含有be动词，否定句在后面加上not，故答案是isn't．
点评 含有be动词，情态动词或者助动词have/has的句子转化成否定时在其后面加上not，一般实意动词的否定式，通常应根据不同时态和人称在实意动词之前加don't，doesn't，didn't等．
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