be to do sth和be going to do 和be about to do 的区别

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  • e to do sth:按计划或安排要发生的事 They are to get married next month.他们下个月要结婚了.be going to do :某人打算要做的事或根据迹象要发生的事 I am going to travel tomorrow.我打算明天去旅行.It is going to rain.要下雨了.be about to do :马上就要发生的事,不与时间状语连用,常与when连用.He was about to go out when the doorbell rang.他刚要出去这时门铃响了.