Here are the identified errors in each sentence:

1. **C** – "find out" should be "found out."
2. **D** – "it will take" should be "it would take."
3. **B** – "Unless it did not rain" should be "Unless it does not rain."
4. **A** – "had I known" should be "if I had known."
5. **C** – "the time when the match started" should be "the time the match started."
6. **A** – "finished" should be "finished," as it's correct but the context may require "had finished."
7. **A** – "more confident" should be "more confident" (correct but also could argue for "confident").
8. **A** – "if I had a map" should be "if I had had a map."
9. **D** – "would write to her" is correct.
10. **C** – "the traffic lights were red" is correct, but could be phrased differently for clarity.

Overall, please note that some sentences might have multiple ways to interpret correctness based on context.