Презентация по английскому языку на тему "Модальные глаголы"

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  Modal verbs
  

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  have to / must / should
  We use have to / must / should + infinitive to talk about obligation, things that are necessary to do, or to give advice about things that are a good idea to do.
  
  

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  Must and have to
  Must and have to are both used for obligation and are often quite similar. They are both followed by the infinitive.
  I must go now. / I have to go now.
  
  

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  There’s something very important about must and have to. The positive forms are very similar in meaning, but the negative forms are completely different.
  You mustn’t forget ... (don’t forget –you have no choice)
  If you don’t like him, you don’t have to see him again. (there is no obligation to see him again, but you have a choice)
  
  

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  In a non-smoking area you mustn’t smoke, but in a smoking area you don’t have to smoke but you can if you want to.
  
  

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  Have changes in the third person singular (he/she/it has); but must doesn’t change. It’s a modal verb and modals don’t change.
  
  

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  should
  We use should for advice, or making suggestions
  Maybe you should go for a coffee or lunch and see how you feel?
  You shouldn’t leave it on the street.
  
  

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  might, may and could
  We use the modal verbs might, may and could + an infinitive form without to when we think it is possible that something is true. We use must when we are sure it is true and can’t when we are sure it isn’t true.
  
  

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  They might (may/could) be some kind of small pig.
  If you are talking about possibility in the past you need the modal + have + past participle.
  She might have taken those photos in China. I may have thrown it away by mistake.
  
  
  

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  Must and can’t
  We use must if we think something is true and can’t if we think something isn’t true.
  So, it must come from an animal.
  That looks like tomato juice, but it can’t be, that would be too easy.