But I 'll also tell them "I have you ON or I have you OFF, particularly if they are pointing at me looking for and answer.
As an aside, I try to use "I see you ON" or "I have you as ON" but counter with the alternate, "I see you OFF the line," or "I have you as OFF the line," because the cadence of the extra two words may help the receiver detect the difference. I mean, we're dealing with a kid who is trying to remember the snap count and the route he's got to run, while also dealing with the other two predominant thoughts dominating a teenage boy's mind: food and females, so the best he's going to hear is "something something something something"; whereas, maybe "something something something something
something else," might trigger a moment of thought.
For rookies: avoid the phrase "you're good." Because you have no clue if the guy is where he is supposed to be for the formation being called.
At lower levels of ball, I'd not have a problem with an official saying to an off-the-line WR, "hey, I need an end here..." to a player. Preventative officiating.