The most impotant thing for us to keep in mind when dealing with an emergency is staying calm.
问题描述：
The most impotant thing for us to keep in mind when dealing with an emergency is staying calm.
when dealing...中间是省略了we are
那这是什么结构?
这是独立主格结构吗?
答
不是独立主格.独立主格以名词或代词开头,详见
应该是状语从句.
The most impotant thing for us to keep in mind （when dealing with an emergency ）is staying calm.