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Solved examples: Modal verbs
Ejemplo resuelto
Can, can't, must, mustn't: "You ___ drive without a licence."
Solution: "You mustn't drive without a licence." Mustn't expresses prohibition (it's forbidden/illegal). Can't can mean inability or that something is not allowed. Must means obligation.
Ejemplo resuelto
Should: "I have a headache." -> Give advice.
Solution: "You should take an aspirin" or "You should rest." Should is used to give advice or recommendations. Shouldn't = advice NOT to do something.
Ejemplo resuelto
Can vs Could: "When I was five, I ___ swim."
Solution: "When I was five, I could swim." Could is the past of can (ability in the past). Could is also used for polite requests: "Could you help me, please?"
Ejercicios
1. Complete with can, can't, must, mustn't, should, shouldn't:
a) You ___ eat in the library. (prohibition)
b) She ___ speak three languages. (ability)
c) You ___ study more for the exam. (advice)
d) Students ___ wear a uniform. (obligation)
e) You ___ eat so much sugar. (advice not to)
2. Write 5 school rules using must/mustn't.
3. Give advice to a friend who is ill using should/shouldn't.
4. Write what you can and can't do.
5. Make polite requests using could: "Could you...?"
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