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13.My favorite subjects are science and P.E..( 改为否定句)
My favorite subjectsaren't scienceorP.E..

分析 我最喜欢的学科是科学和体育.
我最喜欢的学科不是科学和体育.

解答 答案:aren't,or.原句含有be动词are,否定在后加上not,and需换成or,故答案是aren't,or.

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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