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be due to 用来表示某一个时间预期或者计划会发生的事，通常会与表达时间的词或短语连用。 The train is due to arrive at 10:54 p.m. Are you due to hand in your homework this afternook?
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be about to 表示一件很快会就要发生的事，通常不与表达时间的词或短语连用。 The train is about to leave. I’m about to eat. Can I call you back soon?
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be to 表示在某一个时间预期或者计划会发生的事，通常会与表达时间的词或短语连用。与be due to相比，be to更加正式。 The Prime Minister is to discuss trade deals next week. The reporter just said my favorite football player is to visit our city tomorrow. The emergency meeting is to discuss the sudden outbreak of illness in the town. 也可以表示未来的义务以及发出指令或命令。 You are to do your homework without watching any TV. Students are not to leave campus during lunch hours.