高中英语句型归纳

　　1. be doing/ be about to do/ had done…, when…(when：这时, 强调一个动作的突然发生)

　　1). I was walking along the river, when I heard a drowning boy cry for help.

　　2). I was about to leave when it began to rain.

　　3). I had just finished my test paper when the bell rang, announcing the exam was over.

　　2. It was (not ) + 时间段+before +一般过去时 过了一段时间就……..

　　It will (not )be+ 时间段+before +一般现在时 要过一段时间才会…

　　It is/ has been +时间段+ since…..

　　It was +点时间+ when…..

　　It was +时间状语+ that …..(强调句)