Answer :
The text you provided is a series of sentences with missing verbs. Here's the corrected version with the appropriate verbs inserted:
1. He tried very hard but wasn't able to put out the fire before much damage was done.
2. We could finish all the work you wanted me to do yesterday.
3. I couldn't hear you.
4. You were talking quite loudly. (This sentence is grammatically correct as it is).
5. How was the test? Easy, all the students couldn't pass it.
6. He couldn't repair the car but it took him a lot of time.
7. We wanted to go to the opera but we couldn't get tickets.
8. Fortunately, I couldn't get his address from his office.
9. After the accident, she somehow couldn't get through the window, but he did.
10. I was able to swim back to the boat.
11. My daughter could walk when she was only 11 months old.
12. I couldn't walk home.
13. Firefighters put out the fire.
14. Jan gave me a lift home so I couldn't stay at the party till late.
15. He couldn't walk after he had a motorbike accident at the age of 18.
16. I couldn't sleep very well for the last four nights. It has been too hot.
17. I could play tennis really well a few years ago, but not anymore.
18. After the accident, he **could no longer** see much better, but now I wear glasses.
19. When I was a child, I could walk. (This sentence is grammatically correct as it is).
