be doing sth ---- when ---
例 ： He was still smiling when the door opened and his wife came in.
他正笑著的時候門突然開了，他妻子走了進來。
(1) be about to do sth --- when ---
例 ： We were about to start when it began to rain.
我們剛要出發，天就開始下雨了。
(2) had not done sth --- when ---/ hardly --- when ---
例： He had not fallen asleep when the telephone rang.
他剛要入睡電話就響了。
(3) had just done ---- when ---
例 ： I had just gone to bed after a very hard day when the phone rang.
在勞累了一天之後我剛剛就寢，電話鈴就響了。
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