[选择题]时间状语从句1)when, as, while)when表示"当…时"。when引出的时间状语从句,其中的动词既可以是延续性 动作的动词,也可以是瞬间性动作动词。可以表示主句的动作和从句的动作同时发生, 或者从句的动作发生在主句的动作之前。女口: When you apply for a job, you must present your credentials. 当你申请工作时,你必须递交你的有关证件。(同时)Whenthe students heard the teacher ' s footsteps, they all stopped talking. 当学生们听到老师的脚步声时,他们都停止了说话。(从句动作发生在前)when还可以表示just then (正在那时)的意思,此时其引导的从句只放在主句之 后。女口: we were about to start when it began to rain. 我们正要动身,突然下起雨来。b) while表示"在…期间"或"在某一段时间里",其所引导的从句的动作是延 续性的,并侧重表示和主句动作的同时发生。女口: While the teacher paraphrased the text in English, the students listened atte ntively and took notes. 当老师用阐释课文时,同学们注意地听并且做着笔记。The door bell rang while I was watchi ng TV. 我正在看电视的时候门铃响了。while还可以做并列连词,相当于 whereas,连接一个表示对比的并列分句。如: Mary was dressed in blue while Jane was dressed in red. 玛丽穿蓝色的衣服,而珍妮穿红色的衣服。c)as表示"当…时"或"一边…一边"。他引导的时间状语从句的动作也是延续 性的,并且侧重主句动作和从句动作的同时发生 。女口: As the students walked to their dorms, they sang happily. 学生们一边往宿舍走,一边快乐的唱着歌。2002 年第 23 小题__ I knew him better , I discovered that my impression had been right
