Modal verbs: obligation and prohibition

We --- do something now before it's too late!

• must

• mustn't

You ---- across the street on the red light.

• mustn't

• couldn't

What do must and have to are used to?

• Both are use to talk about prohibition

• Both are used to talk about obligation

Most business people ----- wear suits and ties to work.

• have to

• can

Choose the correct sentence.

• All the cyclists has to wear helmets during the event.

• All the cyclists have to wear helmets during the event.

Select the correct one.

• If you are under 16, you couldn't travel alone.

• If you are under 16, you can't travel alone.

Choose the correct one.

They --- not drive in China because our driving license was not accepted there.

• must

• could

Mustn't and can't are used to talk about prohibition.

• True

• False

What is the expression that can be used in any tense?

• have to

• must

• be allowed to

What I have to do to improve my English?

• I must to practice it more to have confidence.

• I can't study anymore.