题目内容
12．Cathy had a great time with her friends at the birthday party．（改为否定句）Cathydidn'thave a great time with her friends at the birthday party．
分析 凯西在生日派对上和她的朋友们玩得很开心，
凯西在生日派对上和她的朋友们玩得不开心，
解答 答案：didn't have．原句had是一般过去时，故借助于did构成否定，后加原形have，故答案是didn't have．
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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