【例句】We were sitting at table when he arrived. 【误解】他到达时，我们正坐在桌旁。 【正确】他到达时，我们正在吃饭。 【说明】be / sit at table表示“进餐”，常不用冠词，加冠词a或the表示坐在桌旁。例如： They were sitting at a table. 他们正坐在桌旁。