Mọi người giúp em với ạ. Cần gấp ạ

19. At four o’clock, we had been playing tennis for three hours.

20. Terry didn’t use to spend so much time playing on his computer.

21. Before we play, make certain that all the cards are there.

22. Hang-gliding can be dangerous, but after a while you get used to it

23. When my trainer told me to do fifty push-ups, I had already run fifteen miles!

24. We never used to spend so much time indoor when I was young.

25. My hobbies take up a lot of my time.

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

27. I think there’s little chance of your winning the competition.