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Who can tell me the difference between "be + doing sth" used for future tense and "due to" in the meaning of being going to do sth with the detailed and specific plan?
thanks,
Hi lawyerquang
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I suspect what you're referring to is probably simply the adjective due, which can mean 'scheduled or expected' and is usually connected with some kind of official arrival time:
"Their flight is due (to arrive) in less than 10 minutes." = "Their flight is scheduled to arrive in less than 10 minutes."
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Using the present continuous to talk about the future refers to a specific plan: "I'm flying to London next Tuesday."
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difference of "due to" and "be + doing smth" 
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