题目内容
18.The coat cost Joan a month's pay.(否定句)The coatdidn cost Joan a month's pay.
分析 大衣花了琼一个月的薪水.
大衣没有花琼一个月的薪水.
解答 答案:didn't cost.结合上文是一般过去时的肯定句,借助于did构成否定,后加原形cost故答案是didn't cost.
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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