题目内容
5.He has to stay up late for the coming exam.(改为否定句)Hedoesn't have to stay up late for the coming exam.
分析 他不得不为了即将到来的考试熬夜很晚.
他没有必要为了即将到来的考试熬夜很晚
解答 答案:doesn't have.原句has to表示不得不,是一般现在时,它的否定式借助于does,加上not,has还原成原形have,故答案是doesn't have.
点评 本题考查肯定句变否定句,做此类题时,需在句子相对应的助动词后加not,若动词为三单或过去时,动词需还原成原形.
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