be going to / will

　　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

　　be to和be going to

　　be to 表示客观安排或受人指示而做某事。

　　be going to 表示主观的打算或计划。

　　I am to play football tomorrow afternoon.　　 (客观安排)

　　I'm going to play football tomorrow afternoon. (主观安排)

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