Here are the sentences rewritten as requested:

12. The patient was too weak to get up. (SO… THAT)
- The patient was too weak SO that he couldn't get up.

13. This room is too small for us to hold the meeting. (ENOUGH)
- This room is not big enough for us to hold the meeting.

14. The test was so difficult that we couldn't do it. (ENOUGH)
- The test was not easy enough for us to do it.

15. The map is so old that I can't read it. (TOO)
- The map is too old for me to read it.

16. He spoke so fast that we couldn't hear him well. (ENOUGH)
- He didn't speak slowly enough for us to hear him well.

17. It was too late for them to go to the movies. (ENOUGH)
- It was not early enough for them to go to the movies.

18. The film is so good that I can't miss it. (TOO)
- The film is too good for me to miss it.

19. The ladder wasn't long enough to reach the window. (TOO)
- The ladder was too short to reach the window.

20. I'm too tired to go to the cinema this evening. (SO… THAT)
- I'm so tired that I can't go to the cinema this evening.