题目内容
1．They are my books．（改为否定句）Theyare not my books．
分析 --它们是我的书．
--它们不是我的书．
解答 答案：are not．考查否定句．根据含有be动词are的陈述句的否定句直接在are后加not，故答案是 are not．
点评 考查否定句．通常是在be动词，情态动词后加not．一般现在时态，主语不是第三人称单数用don't，主语是第三人称单数用doesn't．一般过去时态用didn't．还有其它用法需要牢记．
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