Unit8 Grammar课件 2026 学年沪教版英语八年级下册

这是一份Unit8 Grammar课件 2026 学年沪教版英语八年级下册，共35页。
Grammar（沪教2026版）八年级Unit 8Imagine that!By the end of the lesson, I will be able to...123use because, as, since and because of to express reasons correctly.write reason clauses in different positions with proper punctuation.use these structures to complete grammar exercises accurately.discuss opinions logically with reason expressions in speaking tasks.4Look and talk.Q1: Why does the mother bird stop the kid from going out at first?A1: __________ it is raining heavily outside.Q2: Why does the kid do homework at home in the end? A2: ____the rain is too heavy, he has to stay indoors.BecauseAsQ3: Why did their father refuse to believe them? A3: Since no one else saw the aliens, he thought they were just imagining things.今天我们来聊聊外星生命。你是否也曾好奇不明飞行物（UFO）是否真实存在？现在大家可以试着得出自己的看法。美国国防部已开始公开一批全新的不明飞行物相关档案。其在社交平台 X 上发布声明称：“特朗普总统致力于向公众做到最大限度信息透明。” 特朗普也在真相社交平台上发文表示，民众可以自行解读这批公开文件和视频中的内容，还写道：“不妨一看，乐在其中！”本次首批公开的档案共计 162 份，来源遍布全球，涵盖美国、非洲、阿联酋等多地。例如，其中一份 2023 年 9 月的报告提到，一名无人机驾驶员观测到一个条状发光物体，其亮度极高，甚至能看清空中光带的纹路。还有一张美国国家航空航天局（NASA）1972 年阿波罗 17 号任务拍摄的照片，画面里有三个光点呈三角排列。此外，档案中还包含多段视频，视频里能看到各类飞行物体，有的是快速移动的光点，也有一些轮廓模糊的点状物体在陆地上空飞行。就在这批档案对外公开之际，美国国防部 2024 年的一份报告驳斥了相关传言，否认美国政府曾回收外星科技，也表示目前没有证据证实外星生命真实存在。相关专家也提醒大众理性看待这批公开档案，因为这类资料很容易被误读。Watch and think.核心词汇extraterrestrial life 外星生命Pentagon 美国国防部（代称）transparency n. 透明度rebut v. 反驳，驳斥ambiguous adj. 模糊不清的misinterpret v. 误解，曲解专有名词UFO 不明飞行物Apollo 17 阿波罗 17 号（美国登月任务）drone pilot 无人机驾驶员Q: Why do people have a chance to know more about UFOs?A: Because the Pentagon has released new files on UFOs.Q: Why can people make their own judgments about the files?A: Because Trump said people could decide for themselves what was going on.Q: Why do experts ask people to be careful with these files?A: Because the material can often be misinterpreted.Listen and think.Adverbial clauses of reason原因状语从句Adverbial clauses of reason tell us why things happen.Read the summary of the story on page 117. Pay attention to the words in bold. Then answer the questions. (1) Why was there a loud noise last night?(2) Why couldn’t the spaceship fly?(1) Why was there a loud noise last night?(2) Why couldn’t the spaceship fly?There was a loud noise last night because a spaceship crashed in the forest./Because a spaceship crashed in the forest, there was a loud noise last night.Because of the damage, the spaceship couldn’t fly./The spaceship couldn’t fly because of the damage.• We usually use because, as and since to introduce adverbial clauses of reason. As / Because / Since no one else saw these aliens, I refuse to believe you.• We can put the adverbial clause of reason either before or after the main clause. I refuse to believe you as / because / since no one else saw these aliens.Let's sum up the rules!• When we put the adverbial clause of reason at the beginning of the sentence, we often separate it from the main clause with a comma (,).• We can also use because of to give the reason for something. We can use a noun, a noun phrase or an object pronoun after because of.Look!原因状语从句because、since、as它们都表示“因为”，但在语气和用法上有细微差别。（1）because 表示必然的因果关系，语气最强，通常用来回答由why提出的问题，或位于主句之后。because引导的从句位于句首时，要用逗号和主句分开，放在句中时可不用逗号。They had to stay at home because it was raining hard.（2）since 引导的从句常置于句首，表示已知的、显然的理由，通常被翻译成“既然”，“鉴于”，相当于now that，较为正式，语气比because弱。Since you have time today, you had better help me with my English.（3）as 引导原因状语从句时表示双方已知的原因，语气比since弱，较为正式，对结果的附加说明，可位于句首或句末。As it is raining, you’d better take a taxi.1）because是连词，引导原因状语从句或回答以why开头的特殊疑问句。2）because of是介词短语，其后接名词、代词或动名词。because和so不能用在同一个句子中。 We have to wear masks because of the epidemic.=We have to wear masks because the epidemic broke out.1 The police officer asked Tom some more questions about the aliens. Match the questions with the answers. Then use them to complete the officer’s notes with as, since, because or because of. Remember to write complete sentences.(1) Why was Tina sure that something landed in the forest near the hills? (2) Why did you and Tina hidebehind some bushes?(3) Why did you run away? (4) Why did your father refuse tobelieve you?a We heard some voicesspeaking a strange language.b She heard a loud noise last night.c No one else saw these aliens.d An alien saw us and made aterrible noise.Police officer’s notes(1) (because of) _________________________________________________________________________________________________________ Tina was sure that something landed in the forest near the hill because of a loud noise last night.Police officer’s notes(2) (because) _________________________________________________________________________________________________________ Tina and Tom hid behind some bushes because they heard some voices speaking a strange language.Police officer’s notes(3) (as) ______________________________________________________________________________________________________ Tina and Tom ran away as alien saw them and made a terrible noise.Police officer’s notes(4) (Since) ___________________________________________________________________________________________________ Since no one else saw these aliens, Tina and Tom’s father refused to believe them.Complete the sentences with because, as, since or because of and the phrases below.(1) We explore the ocean __________________________________________.(2) Living on Mars is a possibility in the future______________________________.(3) Jules Verne’s novels have been adapted for films many times_____________ _______________.because we don’t know enough about itbecause of the fast-developing technologyComplete the sentences with because, as, since or because of and the phrases below.(4) I enjoyed watching Journey to the Centre of the Earth _____________________ _______________.(5) ____________________________________________, humans have always wanted to explore it.(6) We don’t know if aliens exist ____________________________________.Because/As/Since Mars is the closest planet to the Earthbecause so much of the universe is unexplored2 Do you think aliens exist? Why or why not? Read the news headlines and discuss the questions in pairs.Aliens exist and they could be living among us, says Britain’s first astronaut S1: Since life exists on Earth, it is possible for it to exist on other planets too.S2: I agree. As there are so many planets in the universe, we’ll discover alien life one day.Why some experts believe alien life might really existWhy some experts believe alien life might really existDiscuss in groups . Aliens in the ForestLast midnight, a strange spaceship crashed in the forest. Tina and her brother Tom felt very nervous __________ (because /as) they heard a loud noise outside their house._____(As /Because of) it was too dark and dangerous to go out at once, they decided to check the spaceship the next morning. They found the broken spaceship finally, and it couldn’t fly anymore ____________(because /because of) the terrible damage from the crash. They also saw some weird aliens with green skin near the ship.__________ (Since /Because of) no other people saw these aliens, their father refused to believe their exciting story. The two kids hid behind bushes later, ______ (as/because) they were afraid that the aliens would notice them. They ran away quickly too, ___________(because of/since) one alien caught sight of them and made a scary sound.From this special experience, Tina and Tom believe aliens really exist. They hope more people can listen to their story one day.语法填空AsThe grammar we have learnedSincebecausebecause ofasbecauseThe grammar we have learnedAdverbial clauses of reasonUnit 8 Imagine that!Grammar Adverbial clauses of reason（原因状语从句）Assessment07Homework08完成练习册对应原因状语从句的选择、填空基础题，整理 4 个结构的用法笔记。就 “Do you think UFOs are real?” 写 5 句话小短文，每句至少用一种本节课学到的原因表达结构。搜集 1 条科技新闻，摘抄里面表原因的句子，分析它用的是 because/since/as/because of 里的哪一种，下节课分享。