结构︰On/Upon+动名词
说明︰此句型意为一就。相当于 once 引导的副词子句.on 后面所跟的动词的动作执行者必须与主要子句的一致。
Upon reaching an appropriate age, children are encouraged, but not forced, to leave the nest。 一达到适当的年龄,孩子们就被鼓励,而不是被强迫,离开老窝。
On entering the classroom, I found a book lying on the floor.
一走进教室,我就发现一本书丢在地上。
Upon receiving your letter, I was as happy as could be. 一收到你的信,我非常高兴。
before + V-ing
结构︰before + 动名词
说明︰此句型意为在之前。before 后面动作的执行者,应该与主要子句中的动作执行者一致。
Before entering a house in some Asian countries, it is good manners to take off your shoes.
在某些亚洲的国家,进屋子之前脱下鞋子才是有礼貌的。
Before reading the book, you had better ask yourself if you have the time.
在读这本书之前,你最好问问自己是否有时间。
Before visiting him, I called him up in advance. 在拜访他之前,我先打电话给他。
of ones own + V-ing
结构︰of ones own+动名词
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