Modal verbs

Modal verbs

obligation, advice

MUST

• Is used to express strong obligation

• You must wear a mask in public places.

• Students must attend their classes.

• The teacher must check the homework.

HAVE TO / HAS TO

• Have to is also used to express obligation.

• We have to wear a mask in public places.

• Students have to do their homework.

• The teacher has to check the homework

MUSTN'T (MUST NOT)

• Students mustn't cheat in the exam.

• You mustn't go into supermarkets without a mask.

• Couples must not cheat on each other.

ABSENCE OF OBLIGATION

• DON'T HAVE TO

• You don't have to use a mask in your car.

• You don't have to go to the doctor every day.

• Laura doesn't have to do the exam.

• DON'T NEED TO / NEEDN'T

• You don't need to use a mask in your car.

• You needn't use a mask in your car.

MUST?

• Must we use a mask in public places?

• Do we have to use a mask in public places?

• Does the president have to quit?

• Must the president quit?

SHOULD / SHOULDN'T (SHOULD NOT)

• Mild obligation, advice.

• You should pay attention to the teacher.

• The teacher should give an extra point to good students.

• Students should not skip classes.

• Jose shouldn't turn off his camera.

• Should the teacher finish the class early?

OUGHT TO / OUGHT NOT TO

• should = ought to | shouldn't = ought not to

• You ought to pay attention to the teacher.

• The teacher ought to give an extra point to good students.

• Students ought not to skip classes.

• Jose ought not to turn off his camera.

• Ought the teacher to finish the class early?

HAD BETTER / HAD BETTER NOT

• Strong advice

• You had better pay attention to the teacher.

• The teacher had better give an extra point to good students.

• Students had better not skip classes.

• Jose had better not turn off his camera.

• I'd better finish the class early.

• She'd better do her homework.

BE SUPPOSED TO

• Strong advice

• You are supposed to pay attention to the teacher.

• The teacher is supposed to give an extra point to good students.

• Students aren't supposed to skip classes.

• Jose isn't supposed turn off his camera.

• I'm supposed to finish the class early.

• She's supposed to do her homework.