1
3.20 1
I had to walk....
3.20 5
don't enjoy having to....
3.20 6
we had to pick up....
3.20 8
they needn't worry...
3.20 2
You'll need to wear.....
3.20 3
you mustn't drink....
3.20 4
we didn't have to pay OR
we didn't need to pay
3.20 10
we needn't have brought OR
we didn't need to bring
3.21 1
Contradiction....can't
3.19 2
optional....don't need to do
3.21 4
Disbelief...can't
3.19 4
recommended...don't need to
3.19 1
prohibited....must not do
3.21 2
Inference...must
3.19 3
mandatory....must be done
3.21 3
Conjecture...must
3.16 A
(1) can't
(2) may
(3) couldn't
3.16 B
(4) may not
(5) could
(6) may
3.16 C
(7) might
(8) may
(9) Could
3.19 5
expedient...need to do