modal verbs activities

Ability: could, can, will be able to

1   Complete the sentences with the affirmative or negative form of could, can or will be able to.

__ One day nanobots will be able to treat diseases.

1_ After the discovery of antibiotics in 1928, doctors ____________________ cure more illnesses.

2_ Even in the future, people ____________________ live forever.

3_ Before X-rays, doctors ____________________ treat people with broken bones.

4_ These days, surgeons ____________________ transplant human faces.

5_ Even today in the 21st century, doctors ____________________ find a cure for the common cold.

Possibility and certainty: may, might, could, must, can’t

3   Correct the mistakes. Two sentences are correct.

__ It might to rain tomorrow. 

__ It might rain tomorrow.

1_ James coulds be an athlete when he’s older.

__ ___________________________________________

__ ___________________________________________

2_ You must be tired after your journey. 

__ ___________________________________________

3_ You can be serious. I don’t believe you! 

__ ___________________________________________

4_ The doctor may tries a new treatment. 

__ ___________________________________________

5_ Nanobots might cure diseases in the future. 

__ ___________________________________________

6_ The answer might be right. I’m sure of it! 

__ ___________________________________________

Advice and obligation: should, must, have to

 4   Complete the text with the words in the box.

When I was twelve, I broke my leg quite badly. The doctors said, ‘You need to stay in hospital because we (1)__________________ treat your leg.’ At first I was too ill to get up, but then I started to feel better and tried to walk. When the nurse saw me, she said, ‘Don’t do that! You (2)__________________ walk yet.’

After a week, my doctor told me, ‘You can go home  now. You (3)__________________ stay here anymore.’ But before I left, he had some advice. ‘Your leg is getting better,’ he said, ‘so you can walk
a little bit. But you (4)__________________ try to walk too much at first. When you sit down, you
(5__________________ rest your leg on a chair. And don’t do anything silly!’