Modal verbs (i) must have to


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Modal verbs (i) must have to

  1. 1. MODAL VERBS (I): Must, have to, don’t have to, mustn’t p. 134
  2. 2. Have to, don’t have to <ul><li>(+) She has to get up at 7 every day. </li></ul><ul><li>You have to drive on the left in the UK. </li></ul><ul><li>(-) We don’t have to wear a uniform. </li></ul><ul><li> He doesn’t have to work today. </li></ul><ul><li>(?) Do we have to study this for the exam? </li></ul><ul><li> Does he have to tidy his room? </li></ul>
  3. 3. <ul><li>Use have to to talk about rules and obligations , or to say that something is necessary. </li></ul><ul><li>I have to study harder if I want to pass the exam. </li></ul><ul><li>Muslims have to pray 5 times a day. </li></ul>
  4. 4. Must, mustn’t <ul><li>(+)You must do your homework tonight. </li></ul><ul><li>She must wash the dishes before she leaves. </li></ul><ul><li>(-) You mustn’t smoke in class. </li></ul><ul><li>They mustn’t leave their bags here. </li></ul><ul><li>(mustn’t = must not) </li></ul>
  5. 5. <ul><li>Use must + infinitive to talk about rules and obligations. </li></ul><ul><li>Must is a modal verb. The only forms are must and mustn’t. </li></ul><ul><li>Must , as ALL MODALS , is ALWAYS followed by infinitive WITHOUT TO!!! </li></ul>
  6. 6. Must vs. Have to <ul><li>Both indicate obligation, but there’s a little difference. </li></ul><ul><li>It’s getting late. I must go now  obligation from the speaker . </li></ul><ul><li>It’s getting late. My mum told me I have to be at home at 9.  obligation from another person . </li></ul>
  7. 7. OBLIGATION FROM THE SPEAKER FROM ANOTHER PERSON I 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. 8. GOTTA <ul><li>In spoken English, especially in the USA, people say got to (or gotta ) instead of have to. </li></ul><ul><li>I gotta go now. It’s getting late. </li></ul><ul><li>I got to study – I have an exam tomorrow. </li></ul>
  9. 9. No obligation/necessity: don’t have to. <ul><li>You don’t have to come to the party if you don’t want to. </li></ul><ul><li>You don’t have to pay for the photocopies, they are free. </li></ul>
  10. 10. Prohibition: mustn’t <ul><li>Don’t have to and mustn’t are completely different. Compare </li></ul><ul><li>You mustn’t smoke inside a hospital. It’s forbbiden. ( It’s the law ) </li></ul><ul><li>You mustn’t drink and drive. </li></ul><ul><li>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 ). </li></ul>