题目内容
15．We have already prepared for the coming class trip．（改为否定句）Wehaven't prepared for the coming class tripyet．
分析 我们已经为将要到的班级旅行做好了准备了．
我们还没有为将要到的班级旅行做好了准备．
解答 答案：haven't yet．原句是现在完成时的肯定句，否定在have后加上not，already是用于肯定句，否定句换成yet，故答案是haven't yet．
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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