Get Obligation Necessity Prohibition Advice Exercises Background. Obligation, lack of obligation, prohibition and advice. We use must to express a personal obligation, to say that in our opinion .
Click here for all the exercises about modal verbs when we talk about.
We use must to express a personal obligation, to say that in our opinion . We use must to express a personal obligation, to say that in our opinion . Click here for all the exercises about modal verbs when we talk about. Be supposed to, be allowed to, etc.