Question

before当连词和介词分别放在什么位置

Answer 1

before作连词,是从属连词连接时间状语从句,
在...之前,与after相反.例如：
*He had been a soldier for three years before he came to our city .
*She had learnt 2000 English words before she went to the USA.
before 作介词,分三种：
1）表时间,这和上面相似.
*She left the office before 9 o'clock.
*I finished studying English before midnight.
区别就是:连词+从句；介词+名词.
2）表顺序,第一、第二、...,也与after相反
*ZhangHong goes before me.
*There are five man before her.
3)表位置,（较不常用）也与after相反
*The car stops before my house.
*The tall tree stands before our school gate.
一般英语里用in front of...\behind...来表示位置的前后.
*The car stops in front of my house.
*The tall tree stands in front of our school gate.

Answer 2

before 可以和过去完成时连接. 下面是具体的内容.你可以从中找到答案. 一. 过去完成时主要有以下几点用法： 1. 表示过去某一时间或动作之前已经发生或完成的动作或存在的状态.句中常用by, before, when, until等词

Answer 3

句中

追问

这个对么

追答

不明白SORRY