1) By the time my mother (to come) home I (to do) my homework. 2) While I (to read) yesterday my sister (to cook). 3) She (to clean) the house by the time I (to cook) dinner. 4) She (to say) that she (to go) there next day. 5) When I (to write) a letter my friend (to watch) TV.
1 came,had done
2 was reading,was cooking (cooked)
3 had cleaned,cooked
4 said, would go
5 was writing,was watching (watched)