6. ‘I want to become a scientist when I grow up’.
-> Nam said that he wants to become a scientist when he grows up.

7. “I can’t drive a car because I’m only 16 years old” said my cousin.
-> My cousin said that he can't drive a car because he is only 16 years old.

8. “I want to become a scientist when I grow up” Minh said to me.
-> Minh told me that he wants to become a scientist when he grows up.

9. Nam is a close friend of mine.
-> Nam is one of my close friends.

10. Minh is one of my cousins.
-> Minh is a cousin of mine.