Funnily enough, Desperate Housewives may be one of the best American sitcoms to learn English because of its natural and unforced use of colloquial (every day) and idiomatic language. The show switches between formal and informal contexts and therefore, you’ll be able to improve your listening skills in a number of different situations. The language used is colorful and it can improve all levels of English and you’ll be able to hear popular sayings such as “it serves him right” and “I want to take a rain check.” (I want to miss this time because I have something to do).