Modal verbs

Obligations: Which are the differences between should/ought to and must/have to?

• should/ought to express a weaker obligation

• must/have to are more formal

• should/ought to are for moral obligations (subjective)

• must/have to impose an obligation to oneself

Prohibition: Which is the difference between MUSTN'T and CAN'T?

• There's no difference

• CAN'T is for regulations, rules and laws

• MUSTN'T is imposed by the speaker

• CAN'T is imposed by an external authority

"Technology may have a positive or negative effect on people". The modal verb indicates:

• Possibility

• Permission

"I can speak English fluently." The modal verb indicates:

• Possibility

• Ability

"May I go to the restroom?" The modal verb indicates:

• Possibility

• Permission

"I can't play the piano." The modal verb indicates:

• Ability

• Possibility

"I can't stop loving you". The modal verb indicates:

• Impossibility.

• Advice.

"I can't understand Math!" The modal verb indicates:

• Possibility

• Ability

You are obliged to finish this work before the end of the week. 

• have to
• needn't
• can
• might 

Tags

CCSS.L.9-10.1B

CCSS.L.4.1C

It is obligatory for students to take part in this curse. 

• Students can 
• Students should
• Students  could
• Students have to