1, had been-> were

2, doing -> to do

3, Unless -> If

4, had I known -> I had known

5, had knew -> had known

6, had finished -> finishes

7, confident -> confidently

8,  would not be lost-> would not have been lost

9, would write to her -> would have written

10, would stop -> would have stopped

11, had you sent -> you had sent

12, was-> were

13, will be sack -> will be sacked

14, will -> would

`15, did not try -> doesn’t try

1 had been=> were  2. doing=> to do  3. did not rain=> rained ( unless= if not ) 

4. had i known=> i had known 5. had knew=> had known  6. had finished=> finishes

7. the=> a   8. had had => had  9. would write=> would have written 

10. had realized=> realized  11. had you sent=> you had sent 

12. spends=> would spend   13. will be sack => will be sacked  14. had been=> is

15. did not try=> doesn't try