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MODAL VERBS (Could/couldn't (To express a hability leraned or natural…
MODAL VERBS
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Should/shouldn't
To give advice or indicate the things that they have to do, in afirmative and negative
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Special Characteristics
They need to go with another verb. This verb, have to go in his infinitive form without to.
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Must/musn't
In negative, it have a different meaning, express prohibition, something that's not permised or something that we can't do it.
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In afirmative, express and strong necessity to do something
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Have to/ Don't have to
In negative, express that do something it's not necessity.
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In positive, express that's necessary do something good, maybe because a rules say it or maybe because the circumstances say it.
In Great Britain, people have to drive on the left.