you are working pretty hard中hard是副词么,那么pretty也是副词,副词可以接副词么

hard副词 people are all working hard.hard是什么副词? hard working里的hard 是副词吗 hard是形容词还是副词? hard的副词 hard副词是什么 well形容词 hard副词 hardly是hard的副词形式吗? work hard是副词修饰动词吧? 副词 英语副词比较pretty,fairly,rather very well是副词修饰副词么~