(
课件网) 外研版 高一年级 必修1 Module 5 Grammar Degrees of comparison 1 Read the sentences about the comparative sizes A: The Yangtze River is about three times as long as the Songhua River. B: The Yangtze River is about three times longer than the Songhua River. C: The Yangtze River is about three times the length of the Songhua River. Think What's the meaning of these sentences？ How do you compare two things Study the sentences and make a conclusion of the comparative structure of adjectives. The brown house’s windows are twice as wide as those of the white house. My handwriting is not half as good as yours. This room is three times as large as that one. 小结: (1) 倍数＋as＋形容词＋as… The white box is four times deeper than the black box. This road is twice longer than that one. The plane flew nine times higher than the kite. 小结: (2) 倍数＋形容词的比较级＋than… The red building is twice the height of the grey building. Our school is three times the size of yours. The street is four times the length of that one. 小结: (3) 倍数＋the size (length, width, height, depth) ＋of… ②倍数+形容词比较级+than … ③倍数+the (size, height, length, weight, width, depth, age) +of … ①倍数（half, once, twice, …times） +as+形容词+as Discuss with your classmates and get conclusions Practice1 Translate the following sentences 1.He earns twice as much as he used to. 2.She spent half as much money as you. 3.This line is four times as long as that one. 4.I am twice as old as he. 5.She studies three times as hard as I. 倍数（half, once, twice, …times） +as+形容词+as 1.It is ten times louder than another. 2.This street is three times wider than that one. 3.I am twice older than he. 倍数+形容词比较级+than … 1.Line A is four times the length of line B. 2.I have five times the number of Tom’s books. 3.It was over twice the distance of the earth from the sun. 倍数+the (size, height, length, weight, width, depth, age) +of … Practice2 Complete the sentences according to the chart. Mars is _____ the earth. (big) Jupiter is _____ from the sun than the earth. (far) Earth Mars Jupiter Diameter(直径) 1 0.5 11 Distance from the sun 1 1.5 5 half as big as five times further 原级比较：表示两者程度相同。 用句型as+形容词/副词+as表示, 否定名式为:not as/so+形容词/副词as。 如： Dick is as tall as his brother. Tom speaks as quickly as his cousin. I have never seen a person as / so clever as he is. 拓展 其它几个关于as…as的句型： as … as one can：尽其所能 He began to run as fast as he could. 他尽其所能跑得快。 as … as possible：尽可能 Please help us as quickly as possible. 请尽可能地帮助我们。 as soon as…一……就…… He will call me as soon as he comes here. 1. Ten years ago the population of our village was _____ that of theirs. A. as twice large as B. twice as large as C. twice as much as D. as twice much as 2. At a rough estimate, Nigeria is _____ Great Britain. A. three times the size as B. the size three times of ... ...
