6、出国之前,我已完成了我的学位论文。I’llbebackbeforeyouhaveleft.你离开之前我就会回来。2.before"……之后才"。Itmaybemanyyearsbeforewemeetagain.可能要过许多年我们才能再见了。Itwasthreedaysbeforehecameback.他三天后才回来。3.before "尚未来得及 "Before she could move, she heard a loud noise, which grew to a terrible roar. 她还没有来得及动弹,就听见有很响的声音,接着就成了可怕的隆隆
7、轰鸣声。 Before they reached the house, a new great wave came, sweeping down trees, and sweeping them down too. 他们还没到屋子,又一个巨浪打来,冲倒了树,也冲倒了他们。 4.before "要……先……"You should be a pupil before you become a teacher. 要当老师,先作学生。 5. before"趁……"You should do it before it is too late. 趁现在还不算太晚,你应该赶快做