Срочно помогите!! За правильность баллы надбавлю
Make up as many sentences as you can using
a) Past Indefinite or Past Perfect:
1. Он вернулся at 6 o'clock
by 6 o'clock
on Saturday
by Monday
at that time
2. Я закончил работу by that time
before you came
while you were away
b) Future Indefinite or Future Perfect:
1. Он вернется at 6 o'clock
by 6 o'clock
on Saturday
by Monday
2. Я закончу работу at that time
by that time
before you come
while you are away