While similar in use to LOOK, COME has more to do with a change in physical location as opposed to a change in direction of attention.
Meanings and uses
Among our group of successful modelers, the following techniques were used successfully:
After getting the hang of "play" and "outside," added "come" before modeling those words
Went to the board, said "come" to bring learner to me, then modeled "come."
What seems to have worked well
Among our group of successful modelers, the following seemed to be helpful:
Pairing it with other words.