Put the verbs into correct form: 1) mother ( to clean) __ the flat before her cousin returned. 2) when we ( to arrive) __ the train ( not to leave ) __ yet. 3) when my brother ( to come ) __ home i ( to read ) a book. 4) he ( to put on ) __ his coat and cap, ( to the door and ( to go ) _ out. 5) at this time yesterday we ( to have ) __ dinner. 6) tom ( to return ) from the cinema by oclock

1) Mother ( had cleaned) the flat before her cousin returned.
2) When we ( arrived) the train ( had not left ) yet.
3) When my brother ( came )  home I ( was reading ) a book.
4) He ( put on ) his coat and cap, ( opened) the door and ( went ) out. 
5) At this time yesterday we ( were having ) dinner. 
6) Tom  ( had returned ИЛИ will have returned) from the cinema by 7 o'clock.