52258 modals of possibility and certainty

We use MAY, MIGHT and COULD when something is possible It may/might rain tomorrow When we are sure that something certain, we use MUST I have put on some weigh, I must lose some kilograms When we are sure that something is not possible or is impossible, we use CAN’T He doesn’t answer the phone, he can’t be at home WRITE ‘must’ or ‘can’t’ 1.- Where is your sister? She …… be in her bedroom doing her homework 2.- Tom’s life …… be easy He earns little money in his job 3.- This book isn’t mine It …… belong to one of your friends 4.- The child has just eaten so he …… be hungry again 5.-Your dad …… smoke a lot of cigarettes because he coughs 6.-That blonde girl …… be Paul’s wife She is too young 7.-The food in this restaurant is really delicious They … have a good chef 8.-Look! This is Vincent’s new car He …… have bought it 9.-People carry umbrellas so it …… be raining 10.- My car doesn’t start Something …… be wrong 11.-That man wears very old clothes He …… be a rich man