高中英语 Unit5 Lessons12 Grammar时间状语从句和让步状语从句讲练 北师大版必修2.doc

时间状语从句和让步状语从句【归纳】时间状语从句 1. when，while，as (1) when引导时间状语从句时表示“当的时候”，强调“特定时间”，从句中既可用延续性动词也可用非延续性动词。如： ill call you when i get there. when the wind blows, all the doors rattle. when i came home, my wife was cooking dinner. (2) while引导时间状语从句时表示“在期间”，其所表示的时间不是一点，而是一段，它强调主句的动作与从句的动作同时持续地进行，此时从句和主句中的谓语动词都必须是延续性动词；有时也可表示主句的动作发生在从句动作的进行过程中，此时主句中的谓语动词通常是非延续性动词。如： study while you study; play while you play. i met her while i was at school. (3)as引导时间状语从句时表示 “当时， 一边一边”， 侧重强调“同一时间”或“一前一后”，表示两个动作同时发生（包括一个主语同时进行两个动作）， 或者一种动作随着另一种动作的变化而变化。如：he jumps as he goes along. as the wind rose the noise increased. as spring warms the good earth, all flowers begin to bloom. 2. until / till 在肯定句中表示“做某事直至某时”，主句动词必须是延续性的。在否定句中表示“直至某时才做某事”, 主句动词可以是延续性的也可以是非延续性的。如：肯定句：wait till i call you. 否定句：she didnt arrive until the show began. 3. 表示“一就”的结构：as soon as和hardly . when, no sooner . than都可以表示“一就”。如：as soon as i got home, it began to rain. = i had hardly got home when it began to rain. = i had no sooner got home than it began to rain. 4. since / ever sincesince / ever since表示“自从以来”，当since / ever since引导时间状语从句时，主句多用现在完成时或现在完成进行时。如：they have been friends ever since they were in primary school. what have you been doing since i last saw you? 5. 引导时间状语从句的单词或短语还有：directly, immediately, after, before, the moment, by the time等。如：immediately he arrived, he started telling us what to do. soon after we joined the motorway, the car started to make a strange noise.before we make a decision, does anyone want to say anything else?he said hed phone you the moment he got home.by the time you get there the meeting will be over.让步状语从句 1. though, although, even though, even if 都可表示“即使，虽然，尽管”，引导让步状语从句， 主句中不用but，但可用yet / still等。如：though he is very old, yet he works very hard. even though he left school at 16, he still managed to become prime minister.2. as和though都表示“尽管”，引导让步状语从句时必须用倒装，即将形容词、副词、名词或实义动词提到句首。如：poor as he is, he is happy. exhausted though she was, there was no hope of her being able to sleep. 3. while表示“尽管”，可引导让步状语从句，但一般要位于句首。如：while i like the color, i dont like the shape. 4. whether . or . 表示“不管还是”，引导让步状语从句。如：whether you believe it or not, it is true. 5. “no matter + 疑问词”或“疑问词 + ever”也可引导让步状语从句。如：no matter what happened, he would not mind. = whatever happened, he would not mind. 【即学即练】i. 翻译下面句子。1. 她得了头奖, 虽然这件事我们都没想到。_2. 他做功课的时候睡着了。_3. 我不到你不能离开。_4. 斯蒂芬到那儿时，音乐会已经开始了。_5. 我摔下楼梯后一直背疼。_6. 汤姆年龄越大显得越有魅力。_7. 吉姆大学一毕业就会去父亲的公司工作。_8. 进教室前鲍勃关了手机。_9. 不管谁来都别开门。_ii. 选用方框内合适的词填空（每个词限用一次）。as, though, before, when, whoever1. john thinks it wont be long _ he is ready for his new job. 2. it was a nice meal, _ a little expensive.3. to show our respect, we usually have to take our gloves off _ we are to shake hands with. 4. its much easier to make friends _ you have similar interests. 5. try _ she might, sue couldnt get the door open.从a、b、c、d四个选项中，选出可以填入空白处的最佳选项。1. _ small, the company has about 1,000 buyers in over 30 countries. (天津2013)a. as b. if c. although d. once2. they promised to develop a software package by the end of this year, _ they might have. (上海2013)a. however difficult b. how difficultc. whatever difficulty d. what difficulty3. he is so busy. he cannot afford enough time with his son _ he wants to. (四川2013)a. even if b. as if c. because d. before4. in the global economy, a new drug for cancer, _ it is discovered, will create many economic possibilities around the world. (江苏2013)a. whatever b. whoever c. wherever d. whichever5. _ i have to give a speech, i get extremely nervous before i start. (山东2013)a. whatever b. whenever c. whoever d. however 6. as is reported, it is 100 years _ qinghua university was founded. (四川 2011)a. when b. before c. after d. since 7. he had no sooner finished his speech _ the students started cheering. (辽宁 2011)a. since b. as c. when d. than 8. please call my secretary to arrange a meeting this afternoon, or _ it is convenient to you. (江西 2011)a. whenever b. however c. whichever d. wherever 9. just use this room for the time being, and well offer you a larger one _ it becomes available. (安徽 2010)a. as soon as b. unless c. as far as d. until 10. because of the heavy traffic, it was already time for lunch break _ she got to her office. (四川 2010) a. since b. that c. when d. until key：grammar【即学即练】i. 1. she won first prize, though none of us had expected it.2. he fell asleep while he was doing his homework.3. dont leave till i arrive. 4. the concert had already started by the time steve got there. 5. ive been getting these pains in my back since i fell down the stairs.6. tom gets more attractive as he gets older.7. jim will start working in hi