be to和be going to

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11.6 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)