Unit 12 Life is full of the unexpected.重点单词 名词:backpack,block,worker,airport,cream,pie,bean, market,fool,discovery,lady,officer 动词:oversleep,burn,cancel,disappear 形容词:unexpected,alive,believable 副词:above,west 连词:till 必备短语 give...a lift,show up,by the end of,sell out 经典句型 1.When I got to school,I realized that I had left my backpack at home. 2.By the time I got back to school,the bell had rung. 3.Before I got to the bus stop,the bus had already left. 4.I was about to go up to my office when I decided to get a coffee first. 5.As I was waiting in line with the other office workers,I heard a loud sound. 语法在线 过去完成时的用法。 写作要求 能够用过去完成时描述在过去某一时间或动作之前已经发生或完成的事情。 Section A(1a-2d)任务一任务二任务一 : 观察对照图片 , 找出每个句子中发生时间较早的动作。 Picture 1 ( )1.By the time the woman went out ofA her house,the bus had leftB. Picture 2 ( )2.When the woman knocked atA the door,someone had comeB in. Picture 3 ( )3.The woman realizedA that she had leftB her backpack at home. B B B 任务一任务二任务二 : 发现按照动作发生、发展的先后顺序 , 晚发生的动作用 时态 ; 早发生的动作结构为 “ ”。 这就是我们本单元要重点学习的过去完成时。 一般过去 ;had+ 过去分词 121.By the time I got up,my brother had already gotten in the shower.我起床时 , 我哥哥已经在洗淋浴了。by the time 意为“在……以前” , 引导时间状语从句 , 从句用一般过去时 , 而主句则常用过去完成时。如 :By the time Jim came into the classroom,our class had already begun.吉姆走进教室前 , 我们已经开始上课了。By the time I got there,the concert had been on for ten minutes.我到那儿时 , 音乐会已经开始十分钟了。12拓展 by 构成的常用短语汇总 :by accident/chance 偶然地 ; 意外by hand 用手工 ( 做的 ); 用手by heart(memory) 熟记 ; 背 ( 诵 ); 牢记by mistake 错误地 ; 无心 ( 做了某错事 )by oneself 独自地by the way 顺便问一下by turns 轮流 ; 交替drop by 顺便访问little by little 一点一点地 ; 逐渐side by side 肩并肩122.My alarm clock didn’t go off!我的闹铃没有响 !go off 在句中意为 “ ( 闹钟 ) 响”。另外 ,go off 还有“开火 ;( 电灯 ) 熄灭” 等意思。试比较 :The gun went off by accident. 枪偶然走火了。Suddenly the lights went off.灯突然熄灭了。拓展 含 off 的词组还有 :set off 出发 ; 开始 put off 推迟 ; 延期take off 脱下 ;( 飞机 ) 起飞get off 下车 hurry off 匆匆离开turn off 关上 ; 关闭 drop off 放下 ; 下车
