Modal Verbs: MUST - HAVE TO - SHOULD

MUST  

Official Rule	Moral Duty	Internal Obligation
Parents must provide food, clothing, shelter, and basic care.	People must look after elders.	I must change my car.

HAVE TO / HAS TO  

Necessity	External Obligation
She has to finish college.	The doctor said I have to stop smoking.

SHOULD

Advice	Recommendation
You should call your bother, it's his birthday.	You should study English.

Complete the exercises: 

1. In order to travel abroad you _________ have a valid passport

2. _________ I take a jacket, mom?

3. My boss said I ________ to deliver the project next week.

4. My boss said I ________ deliver the project asap.

5. In the US you ________ be 21 to drink alcohol. 

6. That restaurant is always full, so I think you _______ call and book a table before going.

7. When visiting a mosque, women ________ wear a scarf on their heads. 

8. Jason _______ to be in the airport 3 hours before his flight to Canada.

9. They _______ pay me back. After all, I've lent them $2000.

10. You _________come over and stay a couple of weeks. 

This is the local pool regulation sign. According to the sign, is the sentence T- true or F - false? 

1. You must have a swimming suit on (  )

2. You have to swim alone (  )

3. You should go to the pool after 8:30 (  )

4. You must leave the pool after 10:00pm (  )

5. You have to play nicely (  )

6. You should smoke in the pool (  )

7. You have to eat outside the pool (  )

8. You have to leave your hair loose in the pool (  ) 

9. You must jump into the pool (  )

10. You must clean your trash (  )

11. Dogs should stay home when you go to this pool (  )

12. Children have to be with their parents (  )

13. You must use the bathroom if you want to go number 1 (  )