be to do表示一种命中注定会发生的事情 will do 表示一种个人意愿(将会做某事,这个主要和be going to do区分) be about to do表示即将、马上、眼瞅着要做某事 例句: 1. Two boys were saying goodbye to each other without knowing they were not to meet again. 2. I'll go to London. 3. The telephone rang when I was about to go out.本回答被提问者采纳