Please, could you tell me what tense should I use in the sentence:
It was very long day, I didn't get home before midnight and was (had been..)(?) very tired by then.
Thanks a lot.
"It was a very long day, I didn't get home before midnight and was very tired by then."
I think this is two sentences joined with a comma.
If not, it seems to need an 'I' before 'was'.
I'd use a semi-colon or dash after 'very long day'.