连续性动词，不管单纯式与进行式，都可以用while。
The band was playing while I was waiting / waited.
※ 引述《howisfashion (台北赵默笙)》之铭言：
: 1. 在文法书习题上看到这样一个句子：
: She is looking for a job while she is in school.
: 因为之前文法书提到"while"后面都是接进行式
: (ex.1.The phone rang while I was sleeping.
: 2.While I was doing my homework, my roommate was watching TV.)
: 想问有没有弄错！
: 重翻了一下文法书，有注记"while = 在那段时间内"！
: 那么我是不是也可以说:
: While I did my homework, my roomate watched TV.
: 毕竟"过去简单式"是指"在过去时间开始并结束的动作或情况"，
: 那不也是"一段时间"?！
The band played while I waited.
The band played while I was waiting.
The band was playing while I waited.
The band was playing while I was waiting.
4句都对!
: 2. 文法解答：
: I wasn't at home last night, and I'm probably not going to be at home
: tonight either.
: 但我认为是: ~ I probably am not going to be ~ .不知道我有没有说错?!
确定性副词: probably, certainly, definitely, clearly, obviously。
He has probably arrived by now. (英国英语一般用法)
He probably has arrived by now. (英国英语强调用法，美国英语一般用法)