1. He lost this book a week ago.
He didn't lose this book a week ago.
When did he lose this book ?
Did he lose this book a week ago ?
2. You will see him tomorrow.
You won't see him tomorrow.
When will you see him ?
Will you see him tomorrow?
3. They go to the swimming pool on Saturdays.
They don't go to the swimming pool on Saturdays.
When do they go to the swimming pool ?
Do they go to the swimming pool on Saturdays?
