题目内容
17.I think he has already managed to solve the problem.(否定句)I don't think he (4)has(5)managed to solve the problem(6)yet.
分析 我认为他已经成功的解答出这个难题了.
我认为他还没有成功的解答出这个难题.
解答 答案:has managed,yet.
think后是宾语从句,改为否定句的时候,将从句的否定转移到主句,already换成yet,故答案是:has managed,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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