have to & must

What is the negative form of 'must'?

• Don't have to

• Mustn't

• No must

• Haven't to

When do we use 'must'?

• To express obligation

• To talk about preferences

• To indicate possibility

• A and C

Which sentence is correct for expressing a lack of obligation?

• I must go to the meeting.

• I have to go to the meeting.

• I don't must go to the meeting.

• I don't have to go to the meeting.

People ________ obey the law.

• mustn't

• have to

• don't have

• must

My parents ____________ watch their diet.

• have to

• must

• has to

• have must

Doctors _____________ help people.

• has to

• have to

• must

• mustn't

I _____________ clean my room, it's very messy.

• must

• mustn't

• has to

• have to

Do you _____ work next weekend?

• Have to

• Must

• Mustn't

Angela, you _____ leave your clothes all over the floor like this.

• Must

• Have to

• Mustn't

If you are under 13 you _____ to get your parents' permission

• Have

• Must

• Mustn't