曾经, 有一个时候

on occasion on the first occasion on this occasion on the present occasion on the occasion of occasion put one's shirt on count on one's card rest on one's laurels rest on one's oars get on one's nerves on occasion on the occasion of... on this occasion on the occasion of occasion on one's own time get on one's feet hang one on turn on one's heel standing on one's head on one's own account put one's finger on