给定一篇英文文章，将其中的名词和动词按照出现频率从高到低排列，输出前5个最常出现的名词和动词。


文章：The quick brown fox jumps over the lazy dog. The dog barks at the fox and runs away. The fox chases the dog but cannot catch it.
Top 5 最常出现的名词：dog (2), fox (2), jumps (1), barks (1), runs (1).

Top 5 最常出现的动词：jumps (1), barks (1), runs (1), chases (1), catch (1).