Who - Asking about people
Who do you like?
Who studies Russian?
What - Asking about things or activities
What does he do at weekends?
What is that?
What kind of / type of - Asking about specific things or characteristics
What type of car do you drive?
What kind of person is he?
What time - Asking for a specific time
What time is it?
What time does the show begin?
What ... like - Asking about characteristics
What was the weather like?
What is Mary like?
When - Asking about general or specific times
When do you like going out?
When does the bus leave?
Where - Asking about places
Where do you live?
Where did you go on vacation?
How - Combined with many words to ask questions about specific characteristics, qualities, quantities, etc. For example: How much (price, quantity), How long (length), How often (frequency)
How often do you go to the movies?
How long was the film?
How much does it cost?
Which - Asking to specify a thing or person from a number of things or people
Which book did you buy?
Which boy won the race?
