It can help, but watching TV can also be a fairly passive exercise, so it depends on the way you do it. It does help with listening skills, offering the chance to listen to various accents, many different moods, etc. However, it is quite easy to watch TV and get a lot of the gist, while actually having a fairly low comprehension of the programme. By all means, watch TV, but try to be active if you want to use it as a learning tool- how much do you recall, are you absorbing new vocab items, etc.
- For Teachers