旧版unit 10 Section A.ppt

* 1.By the time I got outside, the bus had already left. 当我走到外面的时候，公共汽车早已离开了。 ①by the time 到……时为止 【练】在你给我打电话时，我已经离开了公司。 By the time you called me, I had left the company. 现在 将来 got had left 过去完成 一般过去 【归纳】by + 其它时间：不迟于；到……为止 ①by + 现在时间：现在完成 ◇现在我们已经学了2000多个单词了。 We have learnt more than 2000 words by now. ②by + 过去时间：过去完成 ◇到上周五为止，他已经完成工作了。 By last Friday, he had finished the work. ③by + 将来时间：将来完成；一般将来 ◇到本月月底，我们一定是完成了这个工程。 By the end of this month, we will have already finished the project. 1.By the time I got outside, the bus had already left. 到我走到外面的时候，公共汽车早已离开了。 ②already (adv.) 已经 常用于肯定的陈述句，完成时，句中或句尾 ◇yet (adv.) 已经 常用于否定句或疑问句，完成时，句尾 【练】我已经去过那个动物园了。 I have already visited the zoo. 孩子们已经回家了吗? Have the children come home yet? 2. 当我到达学校的时候，我意识到我的背包掉 在家里了。 When I got to school, I realized I had left my backpack at home. ①realize (v.) 意识到，认识；实现 【练】我意识到自己的错误了。 I realized my mistakes. I realized that I made mistakes. 入学考试通过了, 他的梦想就实现了。 He realized his dream when he passed the entrance examination. 2. When I got to school, I realized I had left my backpack at home. ②leave – left – left (v.) 遗忘；忘带；把…留下 【练】今天早晨我把作业忘在家里了。 I left my homework at home this morning. 上完体育课，我把外套忘在操场上了。 After PE class, I left my coat on the playground. 【Note】 leave sth + 地点：把…忘在某处 forget sth / to do / doing：侧重忘了(做)某件事 【归纳】leave 用法 ①离开，脱离 当他离开时, 我们将为他举办一个聚会。 Were giving him a party when he leaves. ②出发；去（leave for） 我们明天动身去香港。 We are leaving for Hong Kong tomorrow. ③留下，剩下 你应该妹妹留一些吃的。 You should leave some of the food for your twin sister. 秘书要他把电话号码留下来。 The secretary asked him to leave his telephone number. 3. 到我走进教室的时候，老师已经开始上课了。 By time I walked into class, the teacher had started teaching already. ◇start doing sth 开始做某事 【练】他从十岁开始踢足球。 She started playing football at the age of ten. ◇start (v.) 开办，创办；出发 【练】他决定创办一份报纸。