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Flash cards. I go through them on the subway on my way to work, on the elevator, whenever I have a minute to run through vocab.

Once I woke up in the middle of the night to hear the roommate that I mentioned above practicing Chinese grammer exercises in his sleep. When he woke up I told him, and then corrected his mistakes. ...

I learned it by living in China for a couple of years.

I'm always impressed by people who can learn in the US - when you're surrounded by people speaking the language its a lot easier (not to say...