User: Give me some movie/tv series to learn English
Assistant: There are several tv series that can be used to learn English. 

1. "Friends" is an American television sitcom that lasts ten seasons from Sep 22, 1994 to May 6, 2004. The show revolves around six friends in their 20s and 30s who live in Manhattan, New York City. The language used in Friends is casual and not challenging to understand. Watching Friends to learn English will help you to build up your vocabulary. 

2. "The Big Bang Theory" is an American television sitcom about two physicists at Caltech who share an apartment and their friends. The show has some challenging English word that requires some domain knowledge to understand. This show is recommended to people who have an intermediate English level.