Who reads a book before going to bed?
When does Peter read a book?
What does Peter read before going to bed?
What processes information with astonishing speed?
What do computers process with astonishing speed?
How do computers process information?
Where do they work twice a week?
How often do they work at the english language laboratory?
What do students know well?
How well do students know grammar rules?
What often breaks down?
How often does the old car break down?