1. Where is he going? (He didn't tell anybody...)
He didn't tell anybody where he was going

2. Where has he gone? (Did you know...)
Did you know where he had gone?

3. Where is he? (Did you know...)
Did you know where he was?

4. When is he leaving school? (I wanted to know...)
I wanted to know when he was leaving school

5. Where does he live? (Nobody knew...)
Nobody knew where he lived

6. When will he come back? (She asked them...)
She asked them when he would come back

7. Where did she buy this hat? (He wanted to know...)
He wanted to know where she had bought that hat

8. How much did she pay for it? (I had no idea...)
I had no idea how much she had paid for it

9. Where did I put the book? (I forgot...)
I forgor where i had put the book

10. Who has given you this nice kitten? (She wanted to know...)
She wanted to know who had given you that nice kitten

11. Where can I buy an English-Russian dictionary? (He asked me...)
He asked me where I could by an English-Russian dictionary

12. How long will it take your brother to get to Madrid? (He wondered...)
He wondered how long would it take my brother to get to Madrid