Subtitles could be helpful, but generally, they won't, especially in countries like Greece where movie translations are abysmally poor. Only translations by certain professionals, i.e., Natasha Syreggela, are of any quality. Subtitles on most movies on Star Channel, AlphaTV, Mega, etc., are so bad, they will confuse you rather than help you. It is best to watch movies without subtitles, but watch the same movie at least 3 times. Renting movies, where you can pause and rewind at will, rather than watching them off of TV would be the best way. Rental movies also offer subtitles in English, or better yet, close-captioning for the hearing impaired, also in English, and that's the best way to watch a movie. Avoid greek subtitles at all costs!