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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youmustlookbothwaysbeforecrossingthestreet中before的用法是不是before后面如果跟动词,要变成动名词?youmustlookbothwaysbefor

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。