http://www.sil.org/lingualinks/literacy/referencematerials/glossaryofliteracyterms/whatisawordbank.htm
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WH Question Words
We use question words to ask certain types of questions. We often refer to them as WH words.
1. WHAT - Asks for information about something
Example: What is your name?
2. WHEN - Asks about time
Example: When are you going to eat?
3. WHERE - Asks in or at what place or position
Example: Where is the school?
4. WHO - Asks what or which people
Example: Who was helping Maria?
5. WHY - Asks for a reason
Example: Why are you laughing?
6. HOW - Asks about a manner
Example: How does this work?