课件19张PPT。Then and nowUnit 4Story timeStep 1 Lead inLet's singFree talkCan you talk about your changes?Before, I was...
I liked / didn't like ...
I could / couldn't ...
Now, I'm ...
I like / don't like ...
I can / can't ...Part A Let’s talkPart B Let’s talkThe air is clean.The air is dirty.Step 2 PresentationHow is the earth now?Let's discussRead the story and finish the table.Listen and readStep 3 The main points1. Now there are many things to help you cook.
help sb. do sth. 帮助某人做某事
2. In 2050, there will be house robots.
there be句型的一般将来时形式
3. Now, there are more and more buildings.
“形容词比较级 + and + 形容词比较级”意为“越来越……”。
4. If we change now, whales and humans will have a
bright future.
这是一个条件句，if意为“假如；如果”。主句用将来时，
从句用一般现在时。 Talk about your hometown’s changes with your partners.Group workStep 4 Let’s practiceWe have only one earth.
We should protect it.Step 5 Test in class1. ____ , there was no gym. People didn’t go by bus.
A. Today
B. At that time
C. Next yearB单项选择。2. I ____ swimming with my friends last weekend.
A. go
B. goes
C. wentC3. Do you ____ your mother _____ the meals?
A. help; cook
B. helps; cooks
C. helped; cookedA4. My brother ____ before.
A. couldn’t ride his bike
B. don’t ride his bike
C. isn’t ride his bike
AStep 6 Conclusion1. 用过去时和现在时进行对比，描述变化。
2. 用将来时描述未来的变化。
Step 7 Homework1.朗读课文对话及故事3遍。
2.写一写你家乡的变化，不少于5句话。
3.完成本课时的配套练习。
