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Obligation, Prohibition, Lack of Obligation Presentation
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Obligation, Prohibition, Lack of Obligation Presentation

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  • 1.  He/She mustn’t be late.Images: Exsodus and Nutdanai  He/She must have atApikhomboonwaroot /FreeDigitalPhotos.net least three years’ experience in education.  He/She doesn’t have to have good ICT skills. Imagine you are responsible for finding a suitable candidate to fill a position for  He/She has to be fun. a new English teacher at the  He/She doesn’t have to school. be a native speaker. Work in pairs/small groups  He/She must be over 25 and decide which of the years old. following sentences describe  He/She mustn’t smoke at a good candidate. school.
  • 2. The meaning of “must” We use must to talk He/She must have at about _____________ least three years’ experience in education. necessity/obligation   absence of He/She must be over 25 years old. necessity/obligation (= don’t need to) • must + infinitive  prohibition WITHOUT “to” • Only for present reference, not for past reference
  • 3. The meaning of “mustn’t” We use mustn’t to talk He/She mustn’t be late. about _____________  necessity/obligation prohibition He/She mustn’t smoke  absence of at school. necessity/obligation (= don’t need to)  prohibition mustn’t + infinitive WITHOUT “to”
  • 4. The meaning of “have to” He/She has to be fun. We use have to to talk about _____________•They HAVE to be fun.  necessity/obligation• DO you HAVE to work  absence ofon Saturday? necessity/obligation• DOES she HAVE to work (= don’t need to)on Saturday?• In past  She/They HAD  prohibitionto be fun• DID you HAVE to go tothe meeting yesterday?
  • 5. The meaning of “don’t have to” He/She doesn’t have to We use don’t have to be a native speaker. to talk about He/She doesn’t have to _____________ have good ICT skills. absence of necessity/obligation • She DOESN’T HAVE to be a  necessity/obligation absence ofnative speaker. (= don’t need to) necessity/obligation but (= don’t need to)• They DON’T HAVE to be  prohibitionnative speakers.• In past  She DIDN’T HAVEto be a native speaker.
  • 6. More information & practice  Unit 23: must, have to, should  Activity 1  Activity 2  Activity 4 (sentences C, D, E, I, J, K)  Activity 5  Activity 6