...个状语：
They arrived at the station twenty minutes before the train was due. 他们在火车发车前20分钟到达车站。
△before间或可引起一个定语或表语从句：
You remember that fellow who came up the evening before you left us? 你还记得那天晚上你离开我们之...
...密斯。即使这个单数名词以字母s结尾也是一样。如：He was late for work,
so he stole past his boss’s office. 他上班迟到了，所以就偷偷地走过老板的办公室。句中的boss虽然以s结尾，它的所有格仍然要加-’s。又如the actress’s beauty的意思...