За правильность 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
He had come back by 6 o`clock.
He came back on Saturday.
He had come back by Monday.
He came back at that time.
2. He had finished his work by that time.
He had finished his work before you came.
He finished his work while you were away.
b) 1. He will come back at 6 o`clock.
He will have come back by 6 o`clock.
He will come back on Saturday.
He will have come back by Monday.
2. I will finish my work at that time.
I will have finished my work by that time.
I will have finished my work before you come.
I will finish while you are away.