There are so many places you can watch TV online these days, which is great! I never watch "regular" TV any more, as once you know all the places to go online, you can watch anything exactly when you want.
Before I run through a few of my favorite sites, I would recommend that you download an extension for your web browser called Media Hint.
It only takes a second to download, but is really important.
Most TV channels: BBC, ITV, Channel 4 etc. (if you are in the UK) will only allow their content to be viewed by people in their own country. Media Hint will remove these restrictions so you can watch TV from all over the world. Result!
With this done, you can watch shows on any of the following sites:
BBC iPlayer, ITV player, 4oD - These sites have shows which have been on TV recently, as well as some online "boxsets" of entire series'.
I also like ABC in the States as a lot of my favourite shows are on this network.
Another great website is Watch Series which has just about every episode of every show you can imagine!
And if you're into sport, VIP League is great for finding links to live sporting events. It also has links for live UK and US TV, too.
Now all you've got to do is to decide what to watch!