老师：Hello, boys and girls. Nice to see you. Welcome back. Today we'll go on Learning Unit 7, protect the earth. In this lesson, we will talk about grammar time and fun time. Last class we Learned protected the earth. What can we do to protect the earth? There are four ways they are. Safe water, save energy, save trees, and don't use too much plastic. Can you choose one topic and say something about it?
老师：Now let's review together. We should save water because water is useful, so we should not waste water. We should reuse and save water. We should save energy because energy is limited. Most of our energy comes from coal and oil, but there's not much coal or oil, so it's limited. We should not drive too much. Pay attention here. So much is used to modify uncountable nouns, which is safe energy.
老师：We should save trees because trees are very useful. We know trees can give us wood, fruit, clean air and homes to birds. So we can also say they are quite important. So we should not cut down so many trees. Notice here, tree is accountable. Now we use so many because so many is used to modify countable nouns. We should save trees.
老师：Lastly, we should not use too much plastic. Why not? Because it's bad for the earth. It can cause white pollution. So we say plastic is pollution. We should now use too many plastic bags or bottles. We should use paper bags and glass bottles. That's right. Now, I have some sentence here. Can you read and judge it's right or wrong?
老师：Let's look together. So we should use paper bags and glass bottles. That's right. We should not save trees. That's wrong. We showed safe trees. They are useful. We should drive so much. No, we shouldn't drive so much because cars use a lot of energy. We should not cut down too many trees. That's right. We should use too many plastic bags and bottles. That's wrong. We should now use too many plastic bags or bottles. We should now waste water. That's right.
老师：Actually, these sentences come from the grammar part. Can you read the sentences again and try to find the rules? What rules can you find? Yes, after sheet or sheet not. We use the verbs original form. So we say somebody should or should not do something. Have you got it? Now let's see if you can use it correctly. So think about it. What else should we do or should we now do to protect the earth?
老师：I have some examples. We should plant more trees. We should protect the animals. We should not waste food. What more? Here are some signs that might be helpful. Think for a little while.
老师：Now look at this picture. What would you say to the lady in pink? You can say you should, you should be quiet. You should talk quietly. You should lower down your voice, right? Good job.
老师：What about this man who jumps the queue? What would you
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