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求专业高手!you mustn`t do it和you must not do it 还有mustn`t have been和must haven`t been有啥区别?
我觉得第一组应该是“你禁止这么做!”和“你一定不要这么做!”
大家觉得呢? 第二组的差别呢?
后面的这两个语法是绝对正确的! 来自《大学英语》语法第一册上情态动词单元的9.9~9.11章节
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推荐答案 2009-10-12
you mustn't do it,语气比you must not do it 要重些,前者突出命令性,后者略显建议性
mustn't have been 一定没有……(强调主观推测/认为没有……)
must haven`t been……(虽然也是主观推测/认为没有……,但强调客观上没有……的可能性)
希望说明白了
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第1个回答 2009-10-11
1.you mustn't do it.是you must not do it.的省略形式,完全一样;
2.must be和must have been一般用于比较肯定的猜测,只用于肯定句,不可用于否定句,所以没有mustn't have been或must haven't been的情况。
第2个回答 2009-10-11
一样的, 它们只是缩写.
must not = mustn't
can not = can't
do not = don't
第二组的差别是
mustn`t have been = 不可以已经
must haven`t been= 必须还没有
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