Question

must must not should shoul not when we have to use​

Answer 1

Explanation:

Must and should both are same but Must is a stronger word than should ,which we used for not avoidable situation.

Ex: You must rest ( when health is destroying)

You must obey elders / law ..

Must not means opposite of Must

Should is used to denote recommendations, advice, for talk about general right or wrong situations.

Ex: You should take rest ( When get tired)

We should chew our food properly.

We should respect our parents.

Should not means opposite of should.