Modal verbs (should, must, have to)

Differences between:MUST and HAVE TO Mustand have to are both used for obligation and are often quite similar. They are both followed by the infinitive. Imustgo now. / Ihave to go now.We often use mustfor morepersonal opinions about what it is necessary to do,and have to for what somebody in authority has said it is necessary to do.I mustremember to get a present for Daisy. (my opinion)You have to look after their hair regularly. (dog experts say so)Do you have to wear a tie for school? (asking about school rules)Havetois more frequent in conversation;Mustis used more in formal writing, for example in written notices.Haveto changes in the third person singular (he has);but mustdoesn’t change. It’s a modal verb and modals don’t change. grouping – have to, mustn't and should You have to... show your passport or identity card to get on a plane. be seventeen to drive a car in the UK. complete a lot of exams, study and training to be a doctor. You mustn't... use your mobile phone during an exam. drive on the right side of the road in the UK – everyone drives on the left! call the emergency services if you just have a cold. You should... arrive at the airport early in case there are delays. always get enough sleep before driving a car. rest and drink lots of liquids if you have a cold. Which sentence is correct? You must to see the Chrysler Building when you're in New York. You must see the Chrysler Building when you're in New York. You have see the Chrysler Building when you're in New York. Which sentence is correct? Do I should call him? Should I call him? I should call him? Which sentence is correct? You don't have to wear uniform in the sixth form. You haven't to wear uniform in the sixth form. You mustn't wear uniform in the sixth form. Which sentence is correct? We don't must make any noise; my grandfather's sleeping. We mustn't make any noise; my grandfather's sleeping. We mustn't to make any noise; my grandfather's sleeping. Which sentence is correct? You really should going and see a doctor about that. You really should to go and see a doctor about that. You really should go and see a doctor about that. Which sentence is correct? He don't should talk to people like that. He doesn't should talk to people like that. He shouldn't talk to people like that. Which sentence is correct? Why we always have to come to the same café? Why do we always have to come to the same café? Why do we always have come to the same café? Which sentence is correct? Must you to make that terrible noise all the time? You must to make that terrible noise all the time? Must you make that terrible noise all the time? Complete the sentences with should or must: 1. We mustbe at the airport by 9.45, or we'll miss the plane.2. It's quite warm. I think you shouldtake off your sweater.3. Theat girl is very ill. She mustgo to the hospital.4. This ice-cream is delicious. You shouldtry it.5. This football match it very important for our team. We mustwin it!6. You shouldgo to the new art gallery. You'll enjoy it.7. You must show your passport at the airport - that's the rule. Complete the text with should, shouldn't, must or mustn't: You mustn't run in the school. It's against the rules.Students mustn'teat chewing gums in class. This is forbidden.If possible, all students shouldtry to do two hours of homework every evening.You shouldn'thave unhealthy food for lunch. It's better to have healthier food.You should walk or take the bus to school if you can. It's good for the environment.You shouldn't wear new clothes on the camping trip. It isn't a good idea.You mustn't eat the berries from that tree. They are poisonous.It's necessary to arrive before 11.00. So you must arrive on time.