ought to,should,need,must,shall有啥区别

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ought to,should,need,must,shall有啥区别
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ought to,should,need,must,shall有啥区别
ought to,should,need,must,shall有啥区别

ought to,should,need,must,shall有啥区别
shoud是shall的过去式,shoud,need,must,shall都是情态动词
可以从意义上区分ought to和should的意思是应该,need是需要,而must是必须