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Your key is who you are watching "at the snap." He is your read for run/pass or the receiver you would watch off the LOS if working deep in 6 or 7 man or the BJ on a 5 man crew. If you are deep in 6 or 7 man, or the BJ on a 5 man crew, after they get off the LOS a little ways you will switch to a zone coverage until the ball is in the air. When the ball is in the air, a good BJ will be going to the receiver with his eyes, and moving that direction with his body.
Grant's site has some nice PPT's for knowing your keys. You can also order an officials manual. You can find that in the back of your rule book.
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