Slowly, please.(Correct me if you see mistakes, please. Thanks!)
Not all sentences that include words such as who, what, when... are questions.
1. Where are we going?
I don’t know where we’re going.
2. Where do you live?
I know where you live.
3. How long have they been together?
It depends on how long they’ve been together.
4. What do they think?
Ask them what they think.
5. What was she doing?
I didn’t see what she was doing.
6. Can you tell me where the bathroom is?
7. I don’t know when we’re leaving.
8. I’m not sure how old she is.
9. Let’s talk about what we’re going to do.
10. It depends on where you live.
11. Do you know what time it is?
12. Think about what you want for dinner.
13. I can’t remember how much it cost.
14. It depends on what you want.
15. I don’t know where the car is.
16. Ask her when we can go.
17. Can you tell me where the bank is?
18. Do you know how long they have been married?
19. What he thinks isn’t important.
20. Look at what you’re doing!
A small correction:
13. I can’t remember how much it costs.