2) By the time his mother / called / Nick had already done his homework .
3) By the time the police / arrived the criminal had already dissapeared.
4) By the time the performance was over it had already started snowing.
5) By the time Sue came home the children had already had dinner.
6) By the time Nick left the discussion had already begun
7) By the time Jack finished his work it had already got dark.
8) By the time the tourists reached their destination the sun had already risen.
9) By the time the I came home my granny had already made tea.
10) By the time the children got up their father had already driven to work.