Who are you? (informal)
How are you? (informal)
What is this?
How much does it cost?
Where do you live? (informal)
Why are you laughing? (informal)
When does the supermarket open?
Where are you going? (informal)
Where do you come from? (informal)
Who are you looking for? (informal)
For whom is this?
Who is this song by?
Who owns this?