Ты: Hello, (имя твоего друга). What are you doing?
Твой друг: Nothing, really.
You: How about going to the zoo, in this aftermoon?
Твой друг: Sorry, I'm busy this aftermoon. Hiw about going tomorrow?
You: Sure, that's really good idea!
Твой друг: OK. See you at 4 o'clock then.