<em>The office</em>. There is an American and a British version. 

But be careful, it's addictive. Full of responsibilities that you're going to put aside just to listen to another episode. That's what happened to me.

These series are good for us who are learning English...

Friends , how I met your mother , The big bang theory , Gossip girl ...enjoy it ;)

The say how i met your mother is better than Friends? :)

Breaking Bad (American crime drama)

Better Call Saul (American crime drama - but watch Breaking Bad first)

Park and Recreation (comedy)

Modern Family (comedy)

The Crown (British - Historical Drama)

Murdoch Mysteries - (Canadian cop/crime series)

Friends... The best show to both have fun and learn some English too.