be to do & be about to do的区别

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be to do & be about to do的区别
be to do & be about to do的区别

be to do & be about to do的区别
两者区别在于:
be to do:有责任,义务,约定的含义,还被用作将来时态,计划做某事.
e.g Parents are to take care of their children.
be about to do:表即将做某事,无感情色彩.
e.g The plane is about to take off.
楼下的抄袭呀.

be to do是指将要作,但没有说什么时候做;
be about to do是指马上作,立即做。
两者区别在于:
be to do:有责任,义务,约定的含义.
e.g Parents are to take care of their children.
be about to do:表即将做某事.
e.g The plane is about to take off.

有一点,ba about to do不能跟时间段连用