Answer key Workbook (pages 30-31)

GRAMMAR
MODALS AND MODAL PERFECTS
1.
1. shouldn't walk alone in the alley
2. might not turn up to the meeting
3. must commute by train
4. can't help us this morning
5. don't have to bring anything
6. May... park in your space today

2.
1. can't
2. must/ should/ have to
3. has to
4. can /could
5. might/ may
6. must
7. couldn't/ weren't able to
8. can

3. POSSIBLE ANSWERS
1. I should have left earlier.
2. he might have got lost
3. she could have been hurt
4. I would have visited you
5. There must have been an accident.

4.
1. should have paid.
2. must have met
3. couldn't recognise
4. would have held
5 must/ has to use
6. couldn't have said.

PAGE 31
6.
1. They will be able to apply for a council house next month
2. They shouldn't have destroyed the forest to build houses in the 1980s
3. they can't have known that plastic bags are banned. I'm sure they would have respected the laws.
4. Could we have learnt from previous mistakes?
5. Sarah needn't have waited in the queue to get the tickets last night.

7. 
1. Las bibliotecas deberían abrir siempre durante todo el día.
2. Una tasa de criminalidad alta podría convertirse en un problema grave.
3. Justin parece triste. Puede que lo hayan rechazado en la entrevista.
4. No deben construir nunca un rascacielos cerca de este lugar emblemático.
5. Las autoridades deberían haber despejado la acera anoche, pero no lo hicieron.

8.
1. has become
2. which
3. has reduced.
4 saves
5 comes
6 doesn't generate
7 began
8 reached
9 when
10 has changed.