1.Do they want to...?
They want to.., don't they?
Do they want to buy some English of Spanish books ?
What do they want to buy?
Who want to...?
2. Did my little sister wake up..?
My little sister woke up....., didn't she?
Did my little sister wake up at seven or nine yesterday?
When did my little sister wake up?
Who woke up at.....?