题目内容
13．He has promised to buy his daughter a new iPad Air（改为否定句）Hehasn't promised to buy his daughter a new iPad Air．
分析 他曾许诺给他的女儿买一个新的iPad Air．
他没有许诺给他的女儿买一个新的iPad Air．
解答 答案：hasn't promised．原句是现在完成时have/has+过去分词，其否定句时在助动词have/has后加上not，故hasn't，故答案是hasn't promised．
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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