Modals of Permission, Obligation, and Prohibition

Drivers ______ always stop on red lights.

• must

• can

• may

• can't

I ______ phone my dad. It's his birthday today.

• can

• may

• ought to

• must

Tell her I ______ see her at once.

• may

• can

• must

• should

______ I speak with your boss?

• Could

• May

• Must

• Have to

You ______ call me between 6 and 7 p.m.; it's our family time.

• can't

• mustn't

• must

• can

What does this sign mean?

• You can't smoke in this area.

• You must smoke in this area.

• You mustn't smoke in this area.

• You don't have to smoke on this area.

What is the appropriate description of this sign?

• You can turn right.

• You must turn right.

• You have to turn right.

• You don't have to turn right.

What does this sign mean?

• You can maintain 50 KPH speed.

• You must maintain 50 KPH speed.

• You have to maintain 50 KPH speed.

• You mustn't maintain 50 KPH speed.

What is the appropriate description of this sign?

• You must throw garbage anywhere.

• You can't throw garbage anywhere.

• You mustn't throw garbage anywhere.

• You don't have to throw garbage anywhere.

What does this sign mean?

• You can use mobile phones inside the classroom.

• You can't use mobile phones inside the classroom.

• You mustn't use mobile phones inside the classroom.

• You don't have to use mobile phones inside the classroom.