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THE MODAL VERBSHAVE TO, DON´T HAVE TO-SHOULD,OUGHT
HAVE TO REFERS ABOUT OBLIGATION OR SOMETHING THAT IT´S NECESSARY TO DO.
She has to clean the floor
I have to feed my dog
HE SAYS I HAVE TO DO MORE EXERCISE(HE SAYS IT IS NECESSARY FOR ME TO EXERCISE MORE)
SHOULD IS USED TO GIVE ADVICE OR EXPRESS SOMETHING THAT IS A GOOD IDEA. CAN BE USED FOR GENERAL SITUATIONS AS WELL AS SPECIFIC
You have a headache. You should take an aspirin.
You should always consult a doctor before taking antibiotics
OUGHT TO
This verb is used in the same way as Should. It expresses a weak obligation.
Karen ought to be more careful
We ought to go together
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