I am about to go when the phone rang.还是ring?

题目

I am about to go when the phone rang.还是ring?
"应该是rang
而且这句子好像有点问题
应该是 I was about to go when the phone rang "
没有I am about to do这样说的吗?

答案

rings.
when时间状语从句用一般现在时,主句用一般将来时,即：主将从现.