should must 表猜测,如何区别?

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should must 表猜测,如何区别?
一定要让我理解哟,
还有，should表猜测可以用于疑问句中吗？

must肯定性推测
should 表示“照说应该”
He is a libarian.He should be in the library now.
表示一种责任上的应该

should must 表猜测,如何区别? should/must表猜测如何区别? must(表猜测)造句 can may must表猜测时的区别 might、may,could和must 表猜测的区别? must should 的区别 should 与must用法区别 should和must的区别 should 与must 的区别 can/should/must后加doing是表示对将来的猜测. must 加动词形式表猜测的用法 must might could can't表猜测的用法