Unit 2 Out of this world Grammar and usage 详解课件-2022-2023学年高中英语译林版（2020）选择性必修第三册

Grammar & Usage 详解课件 新译林2020版 选必三 Unit 2 Out of this world 1. That the earth travels round the sun is a well-known fact. 2. Whether the artist can do it or not is uncertain. 3. Who will act the lead in the play has not been decided yet. 4. Where the young man has gone is not known. 5. When and where the test will be given is not yet decided. Find the subject of each sentence. What can you find? All the subjects are sentences. Lead-in 当主语从句是一个陈述句时，可以由that引导此从句，that 不做成分。 例句： 1) That Hubble is based in space allows it to see further than ground-based telescopes. 2) That he finished writing the composition in such a short time surprised us all. Working out the rules 1 当主语从句是非问句时，可以由whether 引导此从句。当it做形式主语时，whether可以由if替代， 但是如果有or或or not, 则不能替代。 例句： 1) Whether life on other planets does exist is yet to be proved. 2) Whether we’ll go camping tomorrow depends on the weather. 3) It makes no difference whether/if the meeting will be held. 4) It makes no difference whether or not he will come. 2 当主语从句缺少状语时，可以由连接副词引导（when, whenever, where, wherever, how, why）。 例句： 1) It is known to us how he became a writer. 2) Where the English evening will be held has not been announced. 3) When we arrive doesn’t matter. 4) Why he didn’t pass the exam is unknown. 3 当主语从句缺少主语、宾语、表语、定语时，可以由连接代词引导（what, whatever, who, whoever, whom, whomever, whose, which, whichever）。 例句： 1) What he wants to tell us is not clear. 2) Whatever I have done is only for you. 3) Who will win the match is still unknown. 4) Whoever wants to do the job must be interviewed. 5) Whom she borrowed the money from is under investigation. 6) Whose handwriting is the best in the class is known to all. 4 5. it作形式主语引导主语从句 如果主语从句太长，常用it作形式主语，而将主语从句放在句末。常见句型: 1) It +be+形容词(necessary, right, likely, unlikely, wrong, important, certain, true, strange, clear等)+that从句. e.g. It is true that the earth is round. It is strange that he knows nothing about it. It was not clear to me why he behaved like that. 2) It+ be+名词(短语) (