English direct questions

English direct questions. Transform the following direct questions into indirect questions in English. Remember about the right order of the words in the indirect question.
1. Is she over 18?
Do you know if ?
2. Can she speak English?
Do you know if ?
3. How does this machine work?
Can you explain ?
4. Where are you going on holiday?
Have you decided ?
5. What are you going to buy?
Do you know ?
6. Will you be here tomorrow?
Do you know if y?
7. Does she like horse riding?
Have you got any idea if ?
8. How often do you go to the gym?
Can you tell me ?
9. Where does she live?
Do you know ?
10. Has she ever been to London?
I wonder if ?