by the time 有两个意思:一:by the time可以翻译为:这时候,在此时.相当于at the/that time. By the time he had lost contact with the Party. 这时他已和党失去联系。 By the time we had settled in the third bus. 这时我们已在第3辆大汽车里坐好。二:by the time,意为:在.之前已经.by the time our teacher came in ,we had started speaking English.在老师进来前,我们都已经开始讲英语了.你这句话的结构是对的.只是翻译过来感觉有点不是很顺口.by the time when got to the bus station,the bus had left.在我们到达车站时,汽车早就开走了.by+时间名词。意为：“到时（已发生某事），此时谓语多用完成时；最晚、不迟于，在之前”。如：by now/then/this time/next Friday/the end of/three oclock等。 By the end of last year,another new gymnasium had been completed.(2003上海春）到去年年底，又有一座新体育馆峻工了。祝大家一次性通过测试!