1、 When they were making the famous moon-walk,millions of people watched them through television.

题目

1、 When they were making the famous moon-walk,millions of people watched them through television.
2、When we finally arrived on Holyhead nearly everyone was sleeping
为什么两句话when后面的动词一个有ing一个没有,而且跑到后一句去了呢?

答案

简单一点说,一个事件（瞬发）在一个持续事件（持续）发生的时候突然发生,那么持续事件用过去进行时,瞬发事件用过去时.
例如：我写作业（持续）的时候下雨（瞬发）了,这里写作业就要用进行时,下雨要用一般时