be able to? hi! i don't know when we must use "be able to" and his meaning. I've seen in some readings but i don't know that it meaning exactly thanks!

Any web to practise listening? Hello! I'm learning English, but I've got some problems with listening. Can you recommend me any web to see films or TV series in English with subtitles (in English too)? I study grammar or vocabulary with books, or reading, but I think listening is the most difficult because I don't get to understand when people talk or the songs lyrics Thank you very much!