题目内容
4．He has already visited the science museum．（变否定句）Hehasn't visited the science museumyet．
分析 他已经去过科学博物馆了．
他还没有参观过科学博物馆．
解答 答案：hasn't，yet．原句是现在完成时，在has后加上not构成否定，already改为yet，故答案是hasn'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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