How do you identify eligible/ineligible recievers?

[trocared]

becuase of the previous pissing match, I glazed over many of the posts...As a wing, if a player is covered up, I say the number of the covered up player, aloud to myself, to remind me to be aware of: 1. If the play begins as a pass, I locate that covered up player, and 2: when ball is passed over the neutral zone, will throw the flag if he is downfield.
While this forum is of great value to all officials, finding a mentor, talking his ear off while treating him to a meal, is of greater value still. Most experienced officials would love to take an eager, open official under their wing.
Good luck,
tro