By the time i got home, he (go) to bed.
1.by the time i got home, he went to bed.
2.by the time i got home, he was going to bed.
3.by the time i got home, he had gone to bed.

ответ:3)

Объяснение:т.к., ты пришел, а он сделал это до того, как ты пришел, то есть это Past Perfect

1-е правильное

Объяснение:

By the time I got home, he went to bed

так как в предложении he was going совмещены 2 времени

а в предложении had gone неправильная форма глагола go