be to do & be about to do的区别

问题描述:

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...