There was a time when we couldn't go to the office
cannot go to the office
出社できない
the officeは「会社」と言う意味で理解できます。
we couldn't go to the office
出社できなかった。
there was a time when (単数)
there were times when (複数)
〜こともあった
There was a time when we couldn't go to the office
出社できないこともあった
ご参考になれば幸いです。
There were times when staff couldn’t come to the office.
■ There were times when staff couldn’t come to the office.
「スタッフが出社できない時もあった」
There were times = 〜な時もあった
■ Sometimes staff couldn’t come to the office.
「ときどき出社できなかった」