MODAL VERBS

OBLIGATION obligación	MUST (deber)	IT IS OBLIGATORY IT IS COMPULSORY	YOU MUST STUDY HARD IF YOU WANT TO PASS THE EXAMS
OBLIGATION  (SEMI MODAL) obligación	HAVE TO (tener que) HAS TO (3RD PERSON SINGULAR)	IT IS COMPULSORY * ESTE MODAL SE USA CUANDO LAS REGLAS LAS IMPONEN UNA AUTORIDAD	IN BOARDING SCHOOLS, ALL STUDENTS HAVE TO WEAR A UNIFORM
NECESSITY necesidad	NEED TO (necesitar) NEEDS TO (3RD PERSON SINGULAR)	IT IS NECESSARY	WE NEED FLOUR AND EGGS TO MAKE THE CAKE            SOME STUDENTS NEED GLASSES TO STUDY
PROHIBITION prohibición	MUST NOT / MUSTN'T (No debes...)	IT IS PROHIBITED IT IS FORBIDDEN IT IS NOT ALLOWED	YOU MUSTN'T SMOKE IN PUBLIC PLACES.
NO OBLIGATION ausencia de obligación	DON'T HAVE TO DOESN'T HAVE TO (3RD PERSON SINGULAR) (No tienes que...)	IT IS NOT OBLIGATORY IT IS NOT COMPULSOTY IT IS NOT ESSENTIAL	AT MY SCHOOL WE DON'T HAVE TO WEAR A UNIFORM
NO NECESSITY ausencia de necesidad	DON'T NEED TO DOESN'T NEED TO (3rd person sg) (No es necesario...)	IT IS NOT NECESSARY	WE DON'T NEED TO RUN,WE'VE GOT PLENTY OF TIME
ABILITY habilidad	CAN (saber / poder) BE ABLE TO (ser capaz de)	TO BE GOOD AT STH TO KNOW HOW TO DO STH	I CAN PLAY THE GUITAR            SHE CAN SWIM VERY FAST             CAN YOU PLAY CHESS?             IN THE FUTURE, MANY PEOPLE WILLBE ABLE TO SPEAK ENGLISH
ASKING FOR PERMISSION pedir permiso	CAN ¿Puedo...?) COULD (MAS FORMAL) ¿Podría...?	IS IT POSSIBLE?	CAN I GO TO THE TOILET?             COULD I GO TO THE TOILET?
GIVING PERMISSION dar permiso	CAN (Puedes...)	IT IS POSSIBLE IT IS ALLOWED	YOU CAN USE A RED PEN IN THE EXAM
GIVING ADVICE dar consejo	SHOULD SHOULDN'T OUGHT TO OUGHT NOT TO (Deberías / No deberías)	IT IS NOT RECOMMENDED	YOU SHOULD HAVE A HEALTHY LIFE.             YOU SHOULDN'T EAT JUNK FOOD             YOU OUGHT TO DRINK MORE WATER             YOU OUGHT NOT TO EAT TOO MANY SWEETS