the manager left his office after he had finished his work

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the manager left his office after he had finished his work
为什么是after 不是until\before\if

如果要用until 的话,前面得加一个did not.
until可用作介词或连词,意为“到……时候为止”、“到……时候才”或“在……时候以前不”.什么情况下表达什么意思,关键要看（主）句中的谓语动词是终止性动词还是延续性动词.
1. 如果（主）句中的谓语动词是终止性动词,应采用“... not ... until ...”结构,意为“……到……时候才……”.例如：
You mustn’t eat anything until you see the doctor.
看过医生之后,你才能吃东西.
Don’t get off the bus until it has stopped.
车停稳了以后再下车.
2. 如果（主）句中的谓语动词是延续性动词,那么谓语动词用肯定式或否定式,它们所表达的意思有所不同.
1）如果谓语动词为肯定式,则until译为“到……时候为止”.例如：
I watched TV until she came back.
我看电视一直看到她回来.
2）如果谓语动词为否定式,则until应译为“到……时候才”,即“在……以前不”.例如：
I did not watch TV until she came back. （= I began to watch TV when/after she came back.）
直到她回来我才开始看电视.
这句话中left 就是终止性动词,所以用until 的话,前面得用否定形式.

the manager left his office after he had finished his work He left his office after he finished his work last night.的同义 He left the room after he finished all his work.（同义句转换） He did not leave his office until he had finished work这里从句为何 he told me that the manager had already been in his office 那 he told me that the manager had already been in his office 这改为同义句 1.After he finished his homework,he left the library.= after he finished to do his homework,he left the classroom改错 Bob had left his keys in the office,so he had to wait until 1.his work_,he left his office with joy. A finished B being __ finished his work ,he had to stay at home at the weekend. Ted told his father that he had finished his work long( )his