KEY TO PHOTOCOPIES 3A, 3B & 3C

3A
a) 2) mustn't 3) ok 4) had to 5) ok  6) don't have to
b) 2) don't have to 3) must/ have to 4) should 5) mustn't 6) must/ have to 7) shouldn't 8) don't have to

3B
a) 2) might 3) must 4) can't 5) may
b) 1) must 2) might not/ may not, must 3) might/ may, can't, must 4) might/ may, can't, must

3C
a) 2) ok 3) be able to 4) be able to 5) ok 6) will be able to 7) ok 8) ok 9) being able to 10) ok
b) 2) be able to 3) can't 4) been able to 5) could 6) be able to 7) being able to 8) can 9) couldn't  10) could 11) be able to