.高中英语句型归纳1. be doing/ be about to do。be on the point of doing / 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 w
