培英人教版高中英语必修一unit-2课文精讲.pptxVIP

Unit 2;The Road to Modern English;Later in the next century, people from England made voyages to conquer other parts of the world and because of that, English began to be spoken in many other countries. ;Today, more people speak English as their first, second or a foreign language than ever before.;As用法小结;一、as作连词的用法 　　 1. as...as的用法 　　 as...as意为“和……一样”，表示同级的比较。使用时要注意第一个as为副词，第二个as为连词。 基本结构：as+ adj./ adv. +as；否定式：not as/so +adj./ adv. +as e.g. This film is as interesting as that one. 这部电影和那部电影一样有趣。 　　 Your pen writes as smoothly as mine. 你的钢笔书写起来和我的一样流畅。 　　 This dictionary is not as/so useful as you think. 这本字典不如你想象的那样有用。 　　 修饰成分(twice, three times, half, a quarter)须置于第一个as之前。 e.g. Your bag is twice as expensive as mine. 你的袋子比我的贵两倍。 　　　　　;as...as的常见句型： 　　 (1)as...as possible 　　 e.g. Please answer my question as soon as possible. 请尽快回答我的问题。 　　 (2)as...as usual/before 　　 e.g. She looks as pretty as before. 她看起来和以前一样漂亮。 　　 (3)as long as... (引导条件状语从句) 　　 e.g. It took us as long as three years to carry out the plan. 我们花了长达三年的时间才完成这项计划。 　　 (4)as far as 　　 e.g. He walked as far as the railway station yesterday evening. 昨天傍晚，他一直散步到火车站。 (5)as well as 　　 e.g. She cooks as well as her mother does. 她烧菜烧得跟她母亲一样好。;2. as用作连词引导时间状语从句 　　 as与when，while都是引导时间状语从句的从属连词，含义都是“当……的时候”。 区别：用when时，从句的动作可以与主句的动作同时发生，也可以先于主句的动作发生 e.g. It was snowing when he arrived at the construction site. 他到工地时正在下雪。 用while时，从句的动作为一过程，主句动作与从句动作同时进行或在从句动作过程中发生 e.g. He was watching TV while his mother was cooking. 他在看电视，他妈在做饭 用as时，主句和从句的动作同时发生，具有延续的含义 e.g. You will grow wiser as you grow older.　 你会随着年龄的增长越来越聪明。　　;3. as用作连词引导原因状语从句 　　 as，because，since都可以表示因果关系，连接原因状语从句，含义是“因为，由于” 区别：because表示的语气最强 e.g. He will succeed because he is in earnest. 他一定会成功，因为他很认真。 as一般放在句首，语气较弱，较口语化 e.g. As rain has fallen, the air is cooler. 因为下过雨，空气比较清爽。 since常常用在书面语中，表示多为对方已知的、或稍加分析便可得知的原因，有时可译作“既然”　 e.g. Since you are so sure