【简明语法】11.5 be going to / will_英语语法

用于条件句时， be going to　表将来
　　　　　　　 will　表意愿
　　if you are going to make a journey, you'd better get ready for it as soon as possible.
　　now if you will take off your clothes, we will fit the new clothes on you in front of the mirror.