高考英语50个必备精选句型：when句型

　　when 句型：
　　(1) be doing sth ---- when ---
　　例：He was still smiling when the door opened and his wife came in.
　　他正笑着的时候门突然开了，他妻子走了进来。
　　(2) be about to do sth --- when ---
　　例：We were about to start when it began to rain.
　　我们刚要出发，天就开始下雨了。
　　(3) had not done sth --- when ---/ hardly --- when ---
　　例： He had not fallen asleep when the telephone rang.
　　他刚要入睡电话就响了。
　　(4) 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。