1.was stole ->stole
2.have been happened ->have happened
3.breaking ->broken
4.was slept ->slept
5.told that ->told me that
6.did I understand->I understanded
7.is teaching ->was teaching
8.
9.thank -> to thank
10.to exercise ->exercisịng

1. was stole -> was stolen
2. been happened -> happened
3. breaking -> broken
4. was slept -> was sleeping
5. told that -> told me that
6. did I understand -> I understood
7. is teaching -> was teaching
8. going -> to go
9. thank -> to thank
10. to exercise -> exercising