p. 210/ex. 1:

a) I can´t come to your party.

b) Can you play basketball tonight?

c) Can you use a computer?

d) You can´t borrow my bike.

e) We can´t answer this question.

f) I can´t help you.

g) I can´t play this game. 

h) Can you help me?

p. 210/ex. 3:

a) My train leaves at 12.15. I don´t have to get up early.

b) You mustn´t look thrugh my wardrobe ever again!

c) I can hear you very well. You don´t have to shout.

d) The doctor said I mustn´t drink alcohol.

e) You mustn´t tell anybody. Keep it to yourself.

f) You mustn´t drop litter in the street. 

g) The french test has been put off to next week. We don´t have to prepare for it.

i) Justin knows we will  be late. You don´t have to phone him.

j) Visitors to the zoo mustn´t feed the animals. It´s forbidden.

p. 212/ex. 5:

a) Sorry I´m late. I had to go to the libary.

b) My brother could walk before he started talking.

c) You´ve worked very hard. You must be tired.

d) George hadn´t to wait long for the bus.

e) Don´t wait for me. I may be late.

f) Helen couldn´t do her homework, because she was ill.

g) This bus might go to the centre. Shall I ask the driver?

h) Sam dropped the three glasses, but was able to catch one!

p.212/ex. 6:

a) You ought to see a dentist

b) We don´t have to go to school tomorrow.

c) It can´t be John, because he´s in Paris.

d) Ann might be at home.

e) You had to wear a warm coat today.

f) I may be late.

g) I think that I wouldn´t go skiing if I were you.

h) You can´t leave your bike here.

p.213/ex. 8:

a) I have been living here since 2005.

b) My bike must be stolen. 

c) Are there anything to do on friday?

d) This is the first time I have been to London.

e) Jack´s teacher made him to apologise before he left.

f) Maria finished the test when I left. 

g) I can´t have left my wallet on the train.