Presentation on theme: "MODAL VERBS (I): Must, have to, don’t have to, mustn’t"— Presentation transcript:
1 MODAL VERBS (I): Must, have to, don’t have to, mustn’t
2 Have to, don’t have to (+) She has to get up at 7 every day. You have to drive on the left in the UK.(-) We don’t have to wear a uniform.He doesn’t have to work today.(?) Do we have to study this for the exam?Does he have to tidy his room?
3 Use have to to talk about rules and obligations, or to say that something is necessary. I have to study harder if I want to pass the exam.Muslims have to pray 5 times a day.
4 Must, mustn’t (+)You must do your homework tonight. She must wash the dishes before she leaves.(-) You mustn’t smoke in class.They mustn’t leave their bags here.(mustn’t = must not)
5 Use must + infinitive to talk about rules and obligations. Must is a modal verb. The only forms are must and mustn’t.Must, as ALL MODALS, is ALWAYS followed by infinitive WITHOUT TO!!!
6 Must vs. Have toBoth indicate obligation, but there’s a little difference.It’s getting late. I must go now obligation from the speaker.It’s getting late. My mum told me I have to be at home at 9. obligation from another person.
7 I must go to bed. I’m exhausted. OBLIGATIONFROM THE SPEAKERFROM ANOTHER PERSONI must go to bed. I’m exhausted.I must remember to phone her tomorrow – it’s her birthday.You have to wear a seatbelt in the car.Do you have to work on Saturdays?I had to wear a uniform when I was at school.
8 No obligation/necessity: don’t have to. You don’t have to come to the party if you don’t want to.You don’t have to pay for the photocopies, they are free.
9 Prohibition: mustn’tDon’t have to and mustn’t are completely different. CompareYou mustn’t smoke inside a hospital. It’s forbbiden. (It’s the law)You mustn’t drink and drive.You don’t have to drive to the party, I’ll pick you up. (You can drive if you want, but it is not necessary).