英语必修 第三册Unit 3 The world of science教学演示ppt课件

这是一份英语必修 第三册Unit 3 The world of science教学演示ppt课件，共28页。PPT课件主要包含了III，Homework等内容，欢迎下载使用。
Pre-writing
Language pints
While-writing
Pst-writing
Read the instructins fr the experiment and answer the questins. (P35)
1. What d yu think the results f this experiment will be?2. What can yu learn frm this experiment?
1.What d yu think the results f this experiment will be?
The egg will squeeze int the bttle.
2. What can yu learn frm this experiment?
The experiment shws us the effects f air pressure. Air pressure indeed exists, and it is very pwerful.
Check the answers
Watch Egg in a Bttle Experiment
Writing an experiment reprt
Cmplete the bxes with the infrmatin in Activity 5. D further research if necessary.(P35)
_____________________________________
prve whether air pressure really exists
air pressure indeed exists, and it is very pwerful. It is the frce f the air that pushed the egg int the bttle
Summary: Writing an experiment reprt
Three parts
Intrductin: Intrduce the aim f the experiment.
Main bdy: Describe the materials used in the experiment and explain the prcedures.
Cnclusin: Reprt the results and what yu have learnt.
The experiment is designed / aimed t... I prepared..., including... First..., then..., after... After the experiment, I can draw a cnclusin that...
Useful expressins
Exchange drafts
Use the checklist t give feedback n yur partner’s draft.
Revise yur draft!
Share yur reprt!
The experiment is designed t prve whether air pressure really exists. At the beginning f the experiment, I prepared the materials, including a biled egg, a glass bttle whse neck is a bit smaller than the egg, and sme ht water. With all the things prepared, the experiment began.
Reference Text
First, I remved the shell f the egg. Then, I carefully pured sme ht water int the bttle, and shk the bttle gently. After a few minutes, I pured ut the ht water. Just at the same time, I quickly placed the egg n tp f the bttle. T my amazement, the egg squeezed int the bttle at nce.
After the experiment I can draw the cnclusin that air pressure indeed exists, and it is very pwerful. It is the frce f the air that pushed the egg int the bttle.
Imprtant sentences
1. The experiment is designed t prve whether air pressure really exists.
whether 从句在动词prve 后作宾语，即宾语从句，意为“是否”。I asked him whether he had dne it all by himself.
2. I prepared the materials, including a biled egg, a glass bttle whse neck is a bit smaller than the egg, and sme ht water.
including 在句子中为动词的现在分词充当状语。Six peple were killed in the cnflict, including a pliceman.
whse在句子中引导定语从句，修饰先行词bttle。
3. With all the things prepared, the experiment began.
1. with的复合结构：with + 宾语 + 宾语补足语 即with + 名词 / 代词 + 非谓语动词 / 介词短语 / 副 词 /形容词 / 名词。 2. 句中all the things 和prepare 之间为动宾关系，所 以用prepare的过去分词表示被动。
4. It is the frce f the air that pushed the egg int the bttle.
本句为强调句型：it is / was+ 被强调部分 + that / wh + 句子剩余部分
It was with yur generus help that I culd pass the exam.
D an experiment fllwing the teacher’s directin, and write a reprt abut the experiment.