Unit 2 Grammar and usage 课件-2022-2023学年高中英语牛津译林版（2020）选择性必修第三册

Do you know what they are? FAST (Five-hundred-meter Aperture Spherical Telescope) 500米口径球面射电望远镜，也被称为“中国天眼” Galileo telescope Read the article on page 20 and fill in the following table. The use of telescopes to explore space Time Breakthroughs Use In 1990 The Kepler Space Telescope In recent years To detect communication signals between the stars in the universe The Hubble Space Telescope To see further than ground-based telescopes; to play a crucial role in the discovery of the mysterious dark energy In 2009 FAST To search for Earth-size planets orbiting other stars Below is a newspaper feature article on the use of telescopes to explore space. Find the sentences with subject clauses. ( ) ( ) ( ) ( ) 1. That Hubble is based in space allows it to see further than ground-based telescopes, … 2. Whether life on other planets does exist is yet to be proved, but the signs are promising... 3. It is clear that telescopes are crucial tools for space exploration and that developing the required technology will help astronomers all over the world make exciting discoveries. 4. How much we will learn from the telescopes is merely limited by our imagination. that whether it 在句子中起名词作用的各种从句统称为名词性从句。根据它们在句中的语法作用，又可分为主语从句、宾语从句、表语从句和同位语从句。 主语从句的连接词有： 从属连词：that，whether，if 连接代词：what，which，who，whom，whose，whatever，whichever，whoever， whomever 连接副词：when，where，why，how 在复合句中，如作主语的是一个从句，该从句被称为主语从句。主语从句须用陈述语序，单个从句做主语，主句谓语动词一般用单数。 ________ he will come or not is not known yet. It's uncertain ____________ he'll come this evening. 1. that 2. whether/ if that 不充当句子成分，无语义，只起连接作用，不能省略。 Whether whether/if That Hubble is based in space allows it to see further than ground-based teles