用must构成的肯定句,转换为否定句must怎么改?
这要根据情况而定.例①it must be a girl
变否定：it 【can't】be a girl
在这里must表肯定推测,意思为‘一定’ 表示否定推测的词为‘can't'
例②You must eat and drink in the classroom
变否定：You【 mustn't】 eat and drink in the classroom
此处句子并没有判断的意味,而是一种带命令口吻的,此时变否定就应该直接用原形+n't了,mustn't译为：禁止、不可以.常指规章制度等.
例③You must rerurn the book to the library at once
变否定：You 【needn't】 rerurn the book to the library at once
可以与②进行一下比较,②这件事是一件坏事,是说话人必须要绝对制止的,而③这件事性质就不同了,是你不需要怎么怎么样.
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绛旓細I needn't finish my homework now .
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绛旓細浣犲ソ锛屽緢楂樺叴鍦ㄨ繖閲屽洖绛斾綘鐨勯棶棰橈細.She must go.濂逛竴瀹氳璧般
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绛旓細1)must 鑲畾鍙锛歋he must attend the meeting yesterday.鍚﹀畾鍙ワ細She needn't attend the meeting yesterday.涓鑸枒闂彞鍙婂叾鍥炵瓟锛Must she attend the meeting yesterday? Yes, she must. / No, she needn't.鍒掔嚎閮ㄥ垎鎻愰棶锛歐hat must she do yesterday? (鍋囧鍒掔嚎閮ㄥ垎涓篴ttend the meeting鐨勮瘽)2)...
