15. We didn’t  understand them.

-> We wish ………we had understood then………………………………….……..

16. I will be late for school.

->  I wish ………I wouldn't be late for school………………………………….……….

17. The  bus was late today.

-> I wish ……the bus hadn't been late today…………………………………….………..

18. She doesn’t like this place.

->  I wish ……she liked this place…………………………………….………

19. These students talked too much in class.

-> I wish ……these student hadn't talked too much in class…………………………………………….

20. I can’t play basketball.

-> I wish ……I could play basketball………………