Interrogative pronouns and adverbs (mostly used)
1. WHO (for Human Beings): John is calling from New York. –> Who is calling?
2. WHAT: Peter is reading a novel: What is Peter reading?
3. WHOSE: This is dad’s car: Whose car is this?
4. WHEN: Peter is leaving next week. When is Peter leaving?
5. WHICH (not for Human Beings): I prefer this T-shirt. Which T-shirt do you prefer?
6. WHY: Dad is late because he missed his bus. Why is Dad late?
7. WHAT FOR: I am studying sociology to become a sociologist. What are you studying sociology for?
8. HOW: Jane always goes to school by bus. How does Jane always go to school?
9. HOW LONG: The English course lasts 2 hours. How long does the English course last?
10. HOW FAR: The university is about 2 km from Paris. How far is the university from Paris?
11. HOW MANY (+ plurals + countable nouns): His brother owns 3 houses. How many houses does his brother own?
12. HOW MUCH (+ uncountable nouns): I want just one bottle of water. How much water do you want?
!! HOW MUCH is also used to ask for the pric: How much is this car? (Combien coûte cette voiture?)
13. HOW OLD (age): Jenny is 18 (years old). How old is Jenny?
14. HOW OFTEN: Mark goes to the library twice a week. How often does Mark go to the library?
15. WHERE (place): Mark goes to the library. Where does Mark go?
WHERE is where?
Thank you a great deal for mentioning that missing point.