题目内容
8．Ben has finished the plan on reusing natural resources．（改成否定句）Benhasn't finished the plan on reusing natural resources．
分析 本已经完成了再利用自然资源的计划．
本还没有完成再利用自然资源的计划
解答 答案：hasn't．结合has finished 可知是现在完成时have/has+过去分词，否定句在has后加not，故答案是hasn't．
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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