9. She asked me how I knew that 

S asked sb how S V (lùi thì)
10. My friend asked me if Caron had talked to Kevin 

S asked sb if S V(lùi thì)
11. He wanted to know what the time was 
12. She asked me when we would meet again 
13. She asked him if he was crazy 
14. He wanted to know where they had lived 
15. He asked her if she would be at the party
16. She asked me if I could meet her at the station 
17. The teacher wanted to know who knew the answer
18. She wanted to know why he didn’t help her
19. He asked me if I had seen that car 
20. The mother asked the twins if they had tidied up their room