Lesson 25 Let’s Do an Experiment!优质课教案

Lesson25

Let’s Do an Experiment教案

主备人：王静

Ⅰ知识与技能: Mastery words and expressions: science, experiment, fill, prove

Oral words and expressions: theory, jar, upside, observe, right, side up, upside down Ⅱ教学目标: 1. Use the Simple Present Tense. 2. Express certainty and uncertainty Ⅲ教学重点: 1. Learn to express sequence; 2. How to express an experiment. Ⅳ教学难点: Express certainty and uncertainty Ⅴ教学方法: Listening, reading, and speaking Ⅵ教学用具: jar, cardboard, water Ⅶ

教学过程：

Step1. Teacher brings the jar, cardboard and water to the class. Show them to the students and ask what experiments we can do with them. Let the students show them and explain the reasons to the students. Let the students work in groups and discuss the experiments. When one group is doing the experiments, the others can ask the questions. The teacher can ask questions, too. Step2. Now let the students open their books and guess what the experiment is. Ask the students to say it in English. Step3. Read the text silently and answers the following questions. ⑴. What keeps the water in the jar? ⑵. Is Jenny sure of her theory? How do you know?

⑶.Why does Danny put on his raincoat? ⑷. What does Danny conclude? Step4. Read the text carefully and check the answers. Explain some words and expressions to the class. Step5. Explain some words and expressions to the class. 1.

do an experiment 做实验

同义句：carry out/make an experiment 2. I fill a jar with water. 我用水把瓶子装满。

fill…with… 用……装满……(主语是人) 同义句：be filled with.../ be full of... (主语是物) 学生用书装满书包: Students filled their schoolbags with books.

Their schoolbags are filled with / full of books. 3. I turn the jar upside down. 我把广口瓶倒过来。

turn…upside down 把……翻转、倒过来

你能把这个玻璃杯倒过来吗？Can you turn the glass upside down? 反义短语：turn…right side up 把……正面朝上

4. You think the water will pour out, Danny. 丹尼，你认为水会洒出来。

pour在本句中的意思是“涌流”。它还有“倒; 下倾盆大雨：倾诉”的意思。

She poured the rice carefully into the pot. 她小心翼翼地把大米倒入灌中。

The rain has been pouring all day. 倾盆大雨下了一整天了。

You can pour your troubles to a close friend. 你可以向亲密朋友倾诉烦心事。

5. I am so sure of my theory.我如此确信我的理论。

be sure of…

确信……

我确信他所说的。I am sure of what he said. 6. It is strong enough to hold the water.压力大到足以托住水。

句中的enough to do…意为“足以……做某事”，

这里的enough是

副词作用，用在形容词或副词后作状语。

Allan is old enough to go to work. 艾伦到上班年龄了。

Step6. Summary: The experiment is the main part of the text. If we have time, do it in the class. Then ask them to describe what they see. Give a report to the class. If the time in class isn’t enough, let the students do the experiment after class. Then report the result to the class. The teacher can do the experiment for the students, too. Step7. Homework 1. Review the next lesson. 2. Finish off the activity book. Ⅷ

教学反思：

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