Unit 4 Modals of obligation

Is one of my favorite’s topics because I am a rule believer “A world without rules is a mess”

We are going to divide it in Permission, Prohibition, Obligation, No obligation, Recommendation

Permission

You can use “Can” it is often used to ask for and give permission

Prohibition

Use Can´t or must not that means it is prohibit or it is not allowed

Obligation

Use must/ must not to talk about present and future obligation

Use have to/have got to talk about present and future obligation

No obligation

Don’t have to

Recommendation

Should/shouldn’t

http://www.perfect-english-grammar.com/modal-verbs-of-obligation-exercise-1.htm