Помогите !
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 open)__ 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.