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before作连词和介词时有什么区别?
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before作连词和介词时有什么区别?
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答案和解析
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.
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.
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