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18.Mark is watching TV now.(改为否定句)
Markisn'twatchingTV now.

分析 马克现在正在看电视.
马克现在没有在看电视.

解答 答案:isn't watching.原句是现在进行时,含有be动词is,改为否定句的时候在后面加上not,缩写成isn't,故答案是isn't watching.

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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