四级常考语法结构讲解Be about to do sth be about to-V - be on the point of doing sth；just going to do sth即将，就要：Her father is about to retire她即即将退休。As was about to say when you interrupted me我正要张口说话时你打断了我。（注：about to后面跟不定式，而且常与when从句搭配使用）all butall but - 1. all but十形容词（或用在谓语动词前）= very nearly；almost几乎，差不多；2.all but+名词= all except 除外都：Crows all but destroyed a farmers field of corn.群鸦几乎吃光了一位农夫的玉米地。The hikers were exhausted and all but frozen when they were found那些徒步旅行者疲惫
