Ответ:

a.John wouldn't have won matches if he hadn't trained so much.

b. Jenny and Dave were given a lovely wedding present by their friends.

c. Joe doesn't have to catch early train.

d. We mustn't spend too much money.

e. We were not allowed to play in the park.

f. What would you do if you won the lottery?

g. Maybe I'll go out this weekend.

h. She probably won't know her exam results until May.