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should must ought to have to的区别

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should must ought to have to的区别
详细一些(语气强烈程度、客观主观),要举例子.
should must ought to have to的区别
must 说话人的主客观看法
---Must I read again?
---Yes,you must./ No,you needn't.No,you don't have to.
have to 客观事实的需要
He has to change the water for the fish.
(水脏了或里边有死鱼等等客观原因导致的结果)
表示义务和责任
must和have to 语言强硬
ought to 和 should 比较温和
个人感觉should和ought to差别不大