polite

Elias: "Come in, Cobin? I come in, Cobin?"
Corbin: "What do you say Eli?"
Elias: "I come in Cobin?"
Corbin: "No, Eli. You have to say please can I come in."
Elias: "PLEASE, Cobin, I come in?"
Corbin: "Yes, you can. Thank you for asking."