before 的用法
问题描述:
before 的用法
答
before作为介词,与after 相反
1.在.前面
He is standing before the door.他正站在门前
2.在.之前(时间)
He left for nanjing the day before yesterday.他前天离开南京.
作为连词
在.之前
Think well before you decide.再做决定前好好想想
I will do it before I forget.