must,should,ought三个词的区别与用法源于must have dropped itshould have droped it ought to have dropped it难得深夜还有人在,还能帮我解决疑问

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must,should,ought三个词的区别与用法源于must have dropped itshould have droped it ought to have dropped it难得深夜还有人在,还能帮我解决疑问
must,should,ought三个词的区别与用法
源于
must have dropped it
should have droped it
ought to have dropped it
难得深夜还有人在,还能帮我解决疑问

must,should,ought三个词的区别与用法源于must have dropped itshould have droped it ought to have dropped it难得深夜还有人在,还能帮我解决疑问
1.一定已经......
2.应该已经......
3.应该已经......
(should和ought to都是“应该”之意,但后者要比前者语气要强得多 ).

must 强调的是客观上的要求,而should 强调的是主观上的意愿。
ought to 则是一般的用法。