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 rest and drink lots of liquids if you have a cold. 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? Write the words in the correct order to make sentences. 1. You anyone tell mustn’t ! > You mustn’t tell everyone!2. have We early be there to > We have to be there early .3. call remember I Dad to must > I must remember to call Dad .4. don’t to pay have You > You don’t have to pay .5. fruit ! salad should try this You > You should try this fruit salad!6. class You late mustn’t for be > You mustn’t be late for class .7. trainers get new should some You > You should get some new trousers .8. to You eat don’t all have it > You don’t have to eat it all .9. it shouldn’t about worry He > He shouldn’t worry about it .