be about后接to do还是doing？

Question

英语书上有句话是“My visit is all about making friends”
但记得老师说是“be about to do=be going to do”
到底应该是加to do 还是doing?
解释并分析一下 ,为什么英语书上写的是doing，是有别的意思么？

Answer 1

to do 你说的对 be about to do = be going to do

Answer 2

be about to 做为固定搭配,意为“将要(做)XX”后加动词原形do.相当于be going to do sth. be about不用于固定搭配时 doing sth,这时候about为介词，后面跟的是动词ing形式。

Answer 3

应该是to do

Answer 4

to do意思是马上要做

Answer 5

to do