Examples of using "дерётся" in a sentence and their english translations:
Tom is fighting in the street.
Who's Tom been fighting with?
Tom's cat is fighting with Mary's cat.
Jennifer fights.
When he is drunk, he grumbles and fights. When he is sober, he lies on whatever comes to hand and says nothing.
Imogen of the Internet is fighting six bored housewives to win an eBay auction for a bag of premium chai tea.