2018年冀教版八年级下册英语课件：Unit7Lesson 38Hobbies Are Fun(共62张PPT).ppt

大约2/3的学生都参加了会议。 About two thirds of the students attend the meeting. 氧气只占空气的1/5。 About one fifth of air consists of oxygen. 我们班3/5的同学都是女生。 Three fifths of the students in our class are girls. 4. By 2025, the world may have about 8 billion people. billion 十亿，用作名词的定语时复数形式仍为billion；与具体数字连用时复数形式为billion，其后不接of； 完成这个工程花费了他们十亿多美元。 It took them more than one billion dollars to complete the project. 六十亿人口共有一个地球。 Six billion people live on this planet. 与several，many等数目不很具体的词连用时复数形式可为billion(其后的of可以省略)，也可为billions (其后的of不能省略)； 人类的大脑含有几十亿个神经细胞。 The human brain contains several billion nerve cells. 正处于壮年期的地球，至少今后几十亿年也根本不会毁灭。 At this peak of age, the earth should endure for many more billions of years without destruction. 表示泛指数时(其后接of短语)复数形式是billions. 表示“以数十亿计”“大批大批地”可说by billions，也可说by the billion(s)。 以前也没有几十亿的人口。 There were not billions of people. 无数星星在天空闪烁。 Billions of stars twinkled in the sky. 印度每年贸易额的增长也以数十亿计。 Indias trade is also growing by billions of dollars every year. 被动语态 语法讲解建议采用归纳法，如尽可能多的呈现一些相关例句，或可让学生从已学课文中找相应例句，引导学生试着从所观察到的语言现象中总结出语法规律。 1) These dry places are called deserts. 2) Antarctica is covered with snow and ice all year round. 3) It must be treated well for our children and for our children’s children, too! 4) We have been asked to write a report on Asia. 5) It’s pronounced like the letter “A”. to test your sense of observation to test your ability of short-term memory to test your ability to highlight the language points Guess 1) These dry places ___ _____ deserts. 2) Antarctica ___ _______ ____ snow and ice all year round. 3) It must ___ _______well for our children and for our children’s children, too! 4) We ____ _____ _____ to write a report on Asia. 5) It __ ___________ like the letter “A”. are called is covered with Fill in the blanks. be treated have been asked is pronounced 1. It is said that the long bridge _________ in two months. 2. Which language ____ the most widely _______ in the world? 3. The lost boy _______________ (not fi