How to Use Must, Have to, and Need to in English "Must," "have to," and "need to" in the positive or question form are used to speak about responsibilities, obligations and important actions I'm having some trouble understanding this I must ask Peter a few questions She has to work with clients from all over the world1 If you want to work in the USA you mustn't have to shouldn't I don't know speak good English 2 You must have to shouldn't I don't know give someone a clock as a present 3You stop making that unpleasant noise (A father to his son) 5) If you want to watch TV, first you finish your homework 6) If I want to buy a new house I get a mortgage (A Read Online Mcgraw Hill Education 400 Must Have Words For The Toefl 2nd Edition Full Books Have to vs must exercises pdf