=>
I/
11. He said that he had played with her sister for a long time.
-> câu tường thuật, lùi thì HTHT -> QKHT
12. They said that my teacher and their son were the colleague.
-> câu tường thuật, lùi thì HTĐ -> QKĐ
II/
1. She told me that if she had any money, he would buy me a drink.
2. He said if he caught the plane, he would be home by five.
3. My mother said that if I felt unwell, I should stay in bed.
4. Anne asked Jane what she would do if she were having a problem with grammar.
5. Matthew said if he had had his mobile the day before, he could have contacted me. 
6. He wondered what they would call her if the baby was a girl.

Câu tường thuật :

+ Đối với câu điều kiện loại 1 -> lùi thì, HTĐ -> QKĐ/will -> would

+ Đối với câu điều kiện loại 2 và loại 3 -> không lùi thì