题目内容

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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