题目内容
5．He is singing Chinese songs．（改为否定句））Heisn't singing Chinese songs．
分析 --他正在唱中国歌曲．
--他不是正在唱中国歌曲．
解答 答案：isn't．考查否定句．句意"--他正在唱中国歌曲．--他不是正在唱中国歌曲．"，含有be动词is的句子变否定句，直接在is后加not，缩写为isn't．答案是isn't．
点评 本题考查否定句．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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