1. Where
did Ann meet her friends yesterday? (Where?)
2. How
often does he usually have courses? (How often?)
3. Who has
already asked a lot of questions? (Who?)
4. By what
time had the girl cooked dinner yesterday? (What?)
5. When
will they be watching an interesting film? (When?)
6. How long
has the boy already been playing the guitar? (How long?)