广州版初二英语上册Unit2同步辅导【课堂演练】一、听写Unit 2重点单词和短语并引导学生注意其基本用法：___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________二、重点词组：1. a long time ago 很久以前2. for a long time 很长一段时间3. order sb to do sth 命令某人干什么4. ask sb for help 向某人寻求帮助5. the number of ….的数目6. copy down 抄写下来7. at first 首先，第一8. help sb do sth 帮助某人干什么9. in this way 用这种方法10. so that 以便三、重点词组解析：（一）If引导的条件句：a. if引导的条件句主句用一般将来时态，从句用一般现在时态。
If you fail in the exam，you will let him down．如果你考试不及格，你会让他失望的。
b. if从句用一般现在时，主句用may / might / canIf the fog gets thicker the plane may/might be diverted.如果雾在大一些，飞机可能就会改在别的机场降落。
If it stops snowing we can go out. 如果雪停了，我们就可以出去。
c．if从句用一般现在时，主句用must/shouldIf you want to lose weight you must/should eat less bread. 如果你想减肥，你必须少吃面包。
d．if从句用一般现在时，主句用一般现在时If you heat ice it turns to water. (也可用will turn)如果把冰加热，它就会化成水。
热身练习：1. If you ____________(feel) tired, you _______________ (have) to have a rest.2. Where ___________ he _________(see) the film if he _______________(have) time?3. If there ______________(be) fewer trees, there _______________( be) more pollution.4. He ____________________(dress)? more casually if he ________________( not work) on weekends.5. If Marcia _____________(live) alone, she ___________________( keep) a pet parrot.6. Lana ________________( buy) a new dress if the old one _____________(be) out of style.7. The twins ______________(fight) if they_______________(argue).8. I __________________(have) a bake sale if I _____________(need) money for education.9. Peter _____________( send) me a beautiful souvenir if he ________________(tour) Spain.10. If Mr Green ___________(say) I am hard- working, my parents ____________( feel) glad.（二）A number of /the number of 的用法：a. A number of us students are from south. 我的学生中许多人来自南方。
b. The number of people who are ill is five. 生病的人数是5个。
a number of 意为“一些”“许多”，是个固定词组，用做定语，of 后面跟的名词或代词是复数形式。
a number of 所修饰的名词或代词在句中做主语用时，谓语动词常用复数形式。
The number of 意为“-----的数目”，用做句子的主语时，谓语动词用单数形式。
热身练习：a. The number of our class fifty –five.（be）b. A number of our class planting the trees. （be）（三）s uch…that：“如此……以致……”such+名词（这个名词前面可以带形容词，也可以不带）so…that: so+形容词或副词，such…that的句型结构可分以下三种：1)such＋a(an)＋adj.＋单数可数名词＋that…clauseHe is such a clever boy that everybody likes him. 他非常聪明，大家都非常喜欢他。
He was such an honest man that he was praised by the teacher.他非常诚实，因而受到了老师的表扬。
2) such＋adj.＋复数可数名词＋that…clauseThey are such interesting novels that I want to read them once again.这些小说非常有趣，我想再读一遍。
3) such＋adj.＋不可数名词＋that…clauseHe has made such great progress that the teachers are pleased with him.他进步得很快，老师们对他感到很满意。
【注意】如果such后边的名词前由many、much、few、little等词所修饰的话，则不用such而用so。
例如：He had so many falls that he was black and blue all over.他摔了很多跤，以致于全身上下青一块，紫一块的。
He had so little education that he was unfit for this job .他所受教育很少，不适合做这个工作。
There were so many people in the street watching the fire that firefighters could not get close to the building. 街上有那么多人观看大火，以致于消防队员无法接近大楼。
so…that也作“如此…以致”解，连接一个表示结果的状语从句。
so…that与such…that意思相同，但用法不同。
现将so…that用法总结如下：so＋adj.／adv.＋that…clause（so的后面跟形容词或副词）He runs so fast that nobody can catch up with him. 他跑得非常快，没人能追上他。
Dr. Wang is so good that everybody loves and respects him.(=He is so good a doctor that everybody loves and respects him.=He is such a good doctor that everybody loves and respects him.)他是一位好医生，大家都尊敬并爱戴他。
注意：当that引导的结果状语从句为肯定句时，so ... that ...可以与be ... enough to do转换；当从句为否定句时，可以与too ... to ... 或be not ... enough to do转换。
so ... that ... 引导结果状语从句有时候可以与such ... that ...句型相互转换。
热身练习1. he was _________ excited that he couldn't get sleep2. this teacher is _________ kind that we all like him3. he ran ____________ quickly that we all couldn't catch up with him4. this is _____________ interesting a book that we all enjoy reading it5. they are __________ interesting books that we all enjoy reading them6. he has__________ many books that I can't count them7. this is__________ an interesting book that we all enjoy reading it8. there was __________ much food that we couldn't eat it all9. I have____________ little money that I cannot afford a car10. he is ___________ a good student that we all like him.11. he is __________ good a student that we all like him.12. it was __________ bad weather that he had to stay at home.(四) too…to so…that enough…to 练习He is too young to go to school. 他太年幼了以至于不能上学。