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2017届高考英语句型归纳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） 1). It was not long before he sensed the danger of the position.不久他就意识到他处境危险2). It will be half a year before you graduate from the school. 还有半年你才从这个学校毕业3). It is 3 years since he worked here.=he left here.（since从句中的谓语动词若是延续性动词，要从这个动作结束的时候算起） 4). It was 3 o’clock when they received the telephone. 5) It was at 3 o’clock that they received the telephone. . once…..一旦….., 表示时间和条件 1)Once you understand what the teacher explained, you will have no difficulty doing the work. | 
