Method 1: Watch TV/Movies
e.g. Gossip Girl ,The O.C., Heroes, Prison Break, Lost, etc.
Method 2: Read books aloud/Listen to audio books
Twilight
Method 3: Sing Songs
Method 4: Listen to Podcasts
The key is to listen and copy what they say. The more you listen and the more you say, the more fluent you will get.
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The Art of the Book: Behind the Covers with Dave Eggers, Chip Kidd, Milton Glaser and moderator Michael Bierut at the 92nd Street Y in New York, December 4, 2006.