1. This accident occurred many years ago.
Q: How long ago did this accident occur?
2. I suppose that her current assistant will be replacing her.
Q: Who do you suppose will be replacing her? (use ‘you' in the question)
3. I got home at 8 o'clock last night. (do not use ‘when')
Q: What time did you get home last night? (use ‘you' in the question)
4. I live in Roubaix now.
Q: Where do you live now? (use ‘you' in the question)
5. They are organising the sale this year.
Q: Who is organising the sale this year?
6. She wore the blue dress to the party.
Q: Which dress did she wear to the party?
7. I suppose that they see each other a couple of times a week.
Q: How often do you suppose they see each other? (use ‘you' in the question)
8. He's seen both films.
Q: Which films has he seen?
9. I'd use acrylic paint on that surface.
Q: What kind of paint would you use on that surface? (use ‘you' in the question)
10. I have one brother and two sisters.
Q: How many brothers and sisters do you have? (use ‘you' in the question)
Phrase 9: The answers ‘what sort of paint or ‘what type of paint' (instead of ‘what kind of paint' are also possible.