A wonderful source to learn English Braille contractions: BRL: Contraction Lookup Dictionary.

If you want to know how a word is written in English contracted Braille, check the accurate and easy to use Braille Contraction Lookup Dictionary! To use the program, simply enter your word into the edit box, click on the Get contraction button, and wait until the contraction appears. If the contraction is not in the dictionary, you will get a message telling you that contraction is not available! If the word is not in the dictionary, or near the end of the alphabet, the program will take a little longer to run! The dictionary is case-sensitive!

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To go to the BRL: Contraction Lookup Dictionary.