when句型
be doing sth...when...
例：He was still smiling when the door opened and his wife came in.
他正笑着的时候门忽然开了，他老婆走了进去。
be about to do sth ... when ...
例：We were about to start when it began to rain.
大家刚要出发，天就开始下雨了。
had just done ... when ...
例：I had just gone to bed after a very hard day when the phone rang.
在劳累了一天之后我刚刚就寝，电话铃就响了。
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