he was about to leave when someone called him 为什么这里的leave不需要加ing形式?或者说什么情况下加?
问题描述：
he was about to leave when someone called him 为什么这里的leave不需要加ing形式?或者说什么情况下加?
答
be about to do 是固定词组“正要去做某事”
答
be about to do是固定短语打算,计划做什么事