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MODAL VERBS                                                                   
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ADVICE, NECESSITY AND OBLIGATION
  1. Golden rules about modal verbs
  2. Advice
  3. Necessity
  4. Obligation
  5. Prohibition
  6. Practise
GOLDEN RULES ABOUT MODAL VERBS
EXPRESSING ADVICE

We use should and ought to to express advice or make recommendations:
  • You should eat less fat if you want to lose weight.
  • You ought to relax if you don´t want to get ill.
  • You shouldn´t be rude to anybody.
  • You  oughtn´t to tell lies.  up
EXPRESSING NECESSITY

We use need to to express necessity:
  • We need to buy some bread for lunch.
Note: Need is not a modal verb.  up

EXPRESSING OBLIGATION OR NO OBLIGATION

We use must and have to to express obligation. The difference between them is :
  • We use must when the obligation is inside the speaker. it is a moral obligation
  • We use have to when the obligation is outside the speaker. It comes from the situation.
  • I must do some exercise to get fit.
  • We have to be quiet in class. That´s the rule.
Note: Have to is not a modal verb.

We use don´t / doesn´t have to, needn´t and don´t /doesn´t need to to express no obligation.
  • You don´t need to get up early. It is Sunday!
  • she doesn´t need to wear a coat. It is warm outside.
  • She needn´t cook tonight. We´re eating out.  up
EXPRESSING PROHIBITION

We use mustn´t to express prohibition.

  • Children under 16 mustn´t go in there
  • At school we mustn´t smoke.  up
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PRACTISE