倍数的表达法.doc

英语课程教案及配套练习基本信息课程名称倍数的表示法课程类型句型类课程出处必修四第二单元课程内容教学内容一. 导入（可用多种教学手段导入）二具体内容英语中倍数的表达法主要有三种形式英语中表示倍数常用once(一倍) ,twice（两倍）, three times（三倍）等。1. 使用形容词，副词的原级times (倍数)+as+形容词（副词）原级+as注意 asas中间使用形容词，副词的原级e.g. I think foreign language are as difficult as science subject. 我任务外语和理科科目一样难。小试牛刀1. Ten years ago the population of our village was _ that of theirs. A. as twice large as B. twice as large asC. twice as much as D. as twice much as解析 句意：十年前我们村的人口数量是他们村的两倍。考查倍数的表达法。Population 应由large或small来修饰，不用much.倍数的表达法是：倍数+as+ large + as.答案B。2. This restaurant wasnt _ that other restaurant we went to. A. half as good as B. as half good asC. as good as half D. good as half as解析 考查倍数的表达法。句意：这家参观还没我们去过的另一家饭店的一半好。当形容词与表达倍数的词连用时，正确的表达法是：1)倍数+as+形容词原级+as 2)倍数+形容词比较级+than.答案A。2. 使用形容词，副词的比较级1）times (倍数)+形容词（副词）比较级+thane.g. My room is three times as large as his. 我的房间是他的三倍大。 2） 形容词（副词）比较级+than+比较对象+by +倍数程度 e.g. The line is longer than that one by twice. 这条线比那条线长2倍。小试牛刀Smoking is so harmful to personal health that it kills _ people each year than traffic accidents. A. seven more times B. seven times more C. over seven times D. seven times解析 句意：抽烟对于个人健康的危害是如此大，以至于每年死于吸烟的人数是死于交通事故的7倍。此题考查倍数的表达法：times more than答案B。3.使用度量名词1） times (倍数)+the+度量名词+of (度量名词：size, height, weight, length, width, depth等) e.g. This tall building is four times the height of that small one.这座建筑物的高度是那个的四倍。2） times + what 引导的从句 e.g. The length of the road is twice what it was three years ago. 这条路的长度是三年前的两倍。小试牛刀They made the longest sofa in the world. It is three times _ the ordinary ones in the world. A. the length of B. so long as C. much longer than D. as length as解析 句意：他们制造了世界上最长的沙发。这个沙发的长度是原来那个的3 倍。本题考查倍数的表达。times (倍数)+the+度量名词+of，此处表示长度，度量名词用length。答案A。下列句型可以互相转换：这个大厅是我们教室的6倍。This hall is six times as large as our classroom.This hall is five times larger than our classroom.(比我们的教室大5倍)This hall is six times the size of our classroom.The size of this