Past tenses and modal verbs

Students ______ use their mobile in class.

• shouldn't
• don't have to
• mustn't

If you have poor grades, your mother is probably going to say: "You ____ work harder."

• should
• must
• don't have to

In most schools, children _____ wear a uniform.

• mustn't
• should
• have to

Students in the university _____ get 80% to pass the course. 70% is enough.

• must
• don't have to
• should

You ____ use your mobile in bed.

• shouldn't
• must
• have to

I ____ go to the party tonight.

• can't
• couldn't
• was able to

I'd like ____ to play the guitar.

• to be able to
• can
• could

I love ____ speak English.

• isn't able to
• being able to
• can

I ____ do my homework last night.

• couldn't
• can't
• were able to

I will ___ run a marathon if I practice a lot.

• be able to
• being able to
• can