also: だったろ
expression
it was, wasn't it?; must have been; I think it was; how might it have been?
Expresses the speaker's conjecture or recollection about a past state or event, often with a seeking-agreement or self-questioning tone. Equivalent to ただろう (past conjectural of だ).
あの時は大変だったろう。
That must have been tough at the time.
彼はもう帰ったんだったろう？
He had already gone home, hadn't he?
どうだったろう、もう覚えていない。
How was it? I don't remember anymore.