题目内容
1.I know.(改为否定句) Idon'tknow.分析 我知道.
我不知道.
解答 答案:don't know.原句是含有实意动词know的一般现在时,主语I,借助于do构成否定,后加原形,故答案是don't know.
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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