19. Our tennis match started at one o'clock and we were still playing at four. (been)
At four o'clock, we three hours.

20. Terry never used to spend so much time playing on his computer. (use)
Terry spend so much time playing on his computer.

21. Before we play, check all the cards are there. (certain)
Before we play, all the cards are there.

22. Hang-gliding can be dangerous, but after a while you don't mind it. (used)
Hang-gliding can be dangerous, but after a while you it.

23. I ran fifteen miles, and then my trainer told me to do fifty push-ups! (already)
When my trainer told me to do fifty push-ups, I fifteen miles!

24. We wouldn't spend so much time indoors when I was young. (used)
We so much time indoors when I was young.

25. I spend a lot of my time on my hobbies. (up)
My hobbies a lot of my time.

26. I would rather play ludo than snakes and ladders. (prefer)
I ludo rather than snakes and ladders.

27. I don't think it's likely that you'll win the competition. (chance)
I think there's the competition.