you must look both ways before crossing the street中before的用法是不是before后面如果跟动词,要变成动名词?

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you must look both ways before crossing the street中before的用法是不是before后面如果跟动词,要变成动名词?
you must look both ways before crossing the street中before的用法
是不是before后面如果跟动词,要变成动名词?

you must look both ways before crossing the street中before的用法是不是before后面如果跟动词,要变成动名词?
介词多数都是这样的用法.接动词就变成ing形式.

是的,你说得正确。