be going to / will

　　用于條件句時， be going to 表將來   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

　　be to和be going to

　　be to 表示客觀安排或受人指示而做某事。

　　be going to 表示主觀的打算或計劃。

　　I am to play football tomorrow afternoon.　　 (客觀安排)

　　I'm going to play football tomorrow afternoon. (主觀安排)

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