英语四级经典必背500句：听力口语关键句71 71 .When will you be through with your work, John? 四级词汇讲解: 本句中，be through 意为 已结束 。本句相当于When will you finish your work? 英语四级考点归纳： 与through有关的短语还有:through and through，get through，see through等。through本身的含义包括: 穿过;贯穿 。如: You can see the three people through the mist.透过薄雾，你能看见那三个人。 自始至终 。如: He will not live through tonight.他活不过今晚了。 因为，凭借 。如: It was through you that we were able to meet again.全仗你的帮助，我们才能重聚。