情态动词must与need可能互换吗?新概念第二册41课,我觉得need与must可以互换,换了意思一样,我列出来:1,you needn't (或mustn't) be so rude about it2,We mustn't (或needn't) buy things we don't need.3,You needn't (或mustn

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情态动词must与need可能互换吗?新概念第二册41课,我觉得need与must可以互换,换了意思一样,我列出来:1,you needn't (或mustn't) be so rude about it2,We mustn't (或needn't) buy things we don't need.3,You needn't (或mustn
情态动词must与need可能互换吗?
新概念第二册41课,我觉得need与must可以互换,换了意思一样,我列出来:
1,you needn't (或mustn't) be so rude about it
2,We mustn't (或needn't) buy things we don't need.
3,You needn't (或mustn't) have said that.
4.I needn't(或mustn't) remind you of that terrible tie you bought yesterday

情态动词must与need可能互换吗?新概念第二册41课,我觉得need与must可以互换,换了意思一样,我列出来:1,you needn't (或mustn't) be so rude about it2,We mustn't (或needn't) buy things we don't need.3,You needn't (或mustn
这个意思完全不对的.
第一句,needn't表示你不需要这么无礼,mustn;t表示一定不能这么无礼.这个我倒觉得musn't更好.原文语境可能和我想的不一样吧
第二句,强调我们不能这样做,可能钱不够啊之类的,needn't则是表示不需要,表示俺们有钱,但不需要去买,和后半句也逻辑有问题
第三句,完全没有mustn;t have done的说法
第四句,mustn't都是要求别人一定不能做,不能对自己
needn't 和mustn't完全不可能互换

不能互换。因为他们表达的意思不一样。
mustn't 是一定不要
needn't是不需要