must should

SHOULD, HAVE TO, MUST

HOW CAN WE USE IT

Let's, or the person + SHOULD, HAVE TO, MUST+ verb infinitive

WE USE IT WITH THE Verb in infinitive

WHEN?

DON'T/DOESN'T HAVE TO (if you do not do it, it is right.), MUSTN'T , SHOULDN'T

We use SHOULD when we want to give advice.

DO/DOES + Person or animal + HAVE TOSHOULD+ Person+ VERB INF

We use HAVE TO when we want to express that some is compulsory

We use MUST when there is a rule or compulsory.