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
• you must look both ways before crossing the street中crossing的用法
• 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crossing的用法这里crossing是动词的ing形式么?还是做了所谓的动名词,要是做了动名词,那the road不就多余了么?还是crossing作了这个状语从句中的从句成分,所以它的动词必须用ing形式?
• while you were walking walking the dog ,you were careless and it got loose and was hit by a car如上题 是不是在 主从句主语一致 和 主语和动词是主动关系时 就可把you were省略
• you must look both ways before you go ____(cross,across)the road