What are you going to be when you grow up?为什么be going to 后面要用be,而不用 do?

what are you going? what are you going? What are you going. or just can't understand what you are going throngh? What are you going.【改错】 what are you going?就是going you don't know what presents you are going to get是什么从句 You and a frien are going out.You are ready,but he or she isn't.What do you say? What are you going to do tomorrow? what are you going to take? what are you going to take是什么意思 what are you going to take? WHAT ARE YOU GOING TO EAT TODAY? What are you going to do today. What are you going to do tomorrow? what are you going to do造句 what are you going to do What are you going to do today?