题目内容
20．雾这么大，为什么不呆在家里呢？How thick the fog is!Why not/Why don't you stay at home？
分析 Why not/Why don't you
解答 答案：Why not/Why don't you
对比中英文句子，可知英文句子中缺少"为什么不"的表达；这是一个提建议的句型，可以用固定句型Why not do sth或Why don't you do sth去表达，意为"为什么不做某事呢？"这里指"为什么不呆在家里呢？"根据后面跟的是动词原形stay，符合此句型的用法．注意首字母要大写．故填写：Why not/Why don't you
点评 此题考查固定句型why not/Why don't you的表达．做题时联系句型的意义和用法就不难做出正确的答案．
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