1. Where did you go last night?
2. Tell me where you went last night.
3. When is your birthday?
4. I want to know when your birthday is.
5. Who is that tall man?
6. I know who that tall man is.
7. What does she want for her birthday?
8. I wonder what she wants for her birthday.
9. Which country do you want to visit?
10. Did you decide which country you want to visit?