题目内容
1．The house is big enough for them to live in．（改为否定句）The houseis not big enough for them to live in．
分析 这个的房子足够大，能让他们住下．
这个房子不够大，对于他们来说住不下．
解答 答案是：isn't．含有be动词的否定句，直接在be动词后加not即可，故填isn't．
点评 含有be动词、情态动词和助动词的句子变为否定句在他们的后面加not即可，可用缩写形式．
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