冀教版九年级英语Unit 5 Lesson25《Let's Do an Experiment》课件 (共15张PPT).ppt

1、Lesson 25 Lets Do an Experiment!1.能正确理解运用 correct,method,force,be sure,fill.with,cover.with,turn.upside down 等单词及短语的用法。（Group A.B.C.)2.能够确定定语从句的先行词和关系词。（Group A.B.)3.能够边做边用英语描述本课的实验。（Group A.B）4.学会依据实验，辨别是非。(Group A.B.C.)Learning goals（学习目标）Learn the new words in groups.Then show your pronunciation.

2、(小组内互相帮助，学习新单词，并展示合作学习成果）Listen to the tape and circle the new words in the text.Try to understand the new words and text.（听录音，划单词，初步理解文章大意及新单词的用法）1.We should do this _（实验）outside!2.I _（装满）the jar with water.3.Lets test which theory is _（正确的）.4.We must use _ _（科学的方法）to solve the problem.5.The _（力量）o

3、f the air keeps the water in the jar.6.I turn the jar _ down and I think the water will_ out.7.I _（断定）that the _（压力）of the air is stronger than I thought.experimentfillcorrectscientificforceconcludemethodpressureupsidepourfillwith 用把装满turnupside down把颠倒pour out 涌出（大声朗读课文，组内合作，完成任务）Group（）1.Where doe

4、s Danny think they should do the experiment?Danny thinks they should do the experiment outside.2.How to do the experiment?Fill a jar with water.Cover the top with a piece of cardboard.Turn the jar upside down.Take your hand off the cardboard.3.What is Jennys idea?Is she sure of her theory?Jenny thin

5、ks the water will stay in the jar.She is so sure of her theory.be sure of sth.对 有把握be sure to do sth.一定（要做某事）be sure that+从句确信1.Are you sure _ it?2.Be sure _ get to school on time.3.Im sure _ he is right.coverwith 用把盖上takeoff 把从拿开oftothat（再次大声朗读，组内合作，探究问题）（Group A.B.)4.Why does Danny put on his rain

6、coat?Because he thinks he will get wet.5.What does Danny conclude?Air is stronger than he thought.6.What keeps the water in the jar?The force of the air/the air pressure三读课文,找出下列词组和句子，并写出其意思。1.fillwith 2.turnupside down3.pour out 4.scientific method5.coverwith 6.be sure of sth7.takeoff 8.the force o

7、f the air 1.I cover the top with a piece of cardboard and hold it there.2.The force of the air keep the water in the jar.3.It is so strong enough to hold the water.4.I am so sure of my theory that Brian can do the experiment and I know you wont get wet.用把装满把颠倒科学的方法涌出用把盖上把从拿开对 有把握空气的压力概念:定语从句：在复合句中修饰

8、名词或代词的句子，叫定语从句。先行词：被定语从句修饰的词叫先行词。关系词：引导定语从句的词叫关系词。(先行词做宾语时，引导定语从句的连词可以省略）I want to know the boy who isthe tallest.句子做定语修饰boy先行词关系词定语从句Mary is a girl who has long hair.关系代词关系副词which,who,whom,whose,thatWhere,when,why(限定性)定语从句的结构用适当的关系词填空：1.The boy _ we saw yesterday is Tom2.The place _ they visited is

9、 very famous.3.The nurse _ is taking the old mans temperature is my aunt.4.How can I get to the bookshop _ has a lot of history books?who/whom/that/不填which/that/不填who/thatwhich/that Lets do the experiment in groups.One(B)gives instructions in English.Another one(C)follows the instructions.The others

10、(A)observe what will happen.Then talk about your observations in groups.And write down the result of the experiment.The cardboard will keep the water in the jar.一、根据汉语完成句子（Group A.B.C)1.我妈妈用布把桌子盖住了My mother _ the table _ cloth.2.我把广口瓶倒置。（C）the jar .3.我不能肯定他什么时候来这儿。(A.B)Im _ _when he will come here.4

11、.他的书包装满了书。He _ his bag _ many books.His bag_ _ _ many books.turn upside downnot sure二、用正确的词组完成短文。(Group A.B.)Danny，Jenny and Brian do an interesting experiment.First,Brian _ the jar _ water,then _ the top _ a piece of cardboard.When he_ the jar _ _ and _ his hand _ the cardboard slowly.Danny thinks

12、the water will _ _.But Jenny_ _ that the water will stay in the jar and Danny will not_ _.Whose theory is_?After the experiment,They_ that the_ of the air helps the cardboard hold the water in the jar.It is strong enough to hold the water.The air is stronger than we thought.fillswithcovers withturns

13、downupsidepour outis sureget wetcorrectconcludeforcetakes offAre you happy in the class?Exchange your feelings in groups.Please use adj.to describe your feelings.(通过自己努力学到的知识快乐吗？组内进行交流，请用形容词描述你在这节课上的的感受)I am/feel_.I think the experiment is_.(happy/excited/successful/interesting/interested(in)/amazing/amazed(at)/fascinating/fantastic)Homework1.Recite the important phrases and sentences（Group A.B.C.）2.Write a short passage（Group A.B.）“An Interesting Experiment”.