1、Unit 7 Protect the Earth 第2课时 Grammar time知识点一 use sth. to do sth.【知识精讲】use sth. to do sth.用某物做某事，to do sth.是不定式，作目的状语。【经典例题】My dad uses some paper _ (make) a bag for me.【名师解析】句意：我爸爸用一些纸给我做书包。to 后面加动词原形，构成不定式，表示目的。所以答案为to make。知识点二 情态动词should【知识精讲】情态动词should 无人称和数的变化；不能单独使用，必须与其后的动词原形构成谓语。should,表示应
2、该，用于劝告、建议和命令。肯定句：1.I should help her because she is in trouble.2. You should go to class right away.should not=shouldnt不应该You shouldnt leave the room now.一般疑问句：Should +主语+动词原形+其他？答语：Yes, 代词+should./ No, 代词+shouldnt.Should I open the window?Yes, you should./ No, you shouldnt.特殊疑问句：特殊疑问词+should +主语+动词
3、原形+其他？What should Tom do?【经典例题】1. You _ use too many plastic bags. A.shouldB.shouldntC.can2.My grandpa should not _(cut) down the trees on the hill. 【名师解析】1. 句意：你不应该用太多的塑料袋。不应该shouldnt，所以选B。2. 情态动词should无人称和数的变化,必须与其后的动词原形构成谓语，所以填cut。课时小练一、单项选择( ) 1. We use wood _ some useful things. A. make B. maki
4、ng C. to make( ) 2. We should _ in the library. A. keep quiet B. keeping quiet C. kept quiet( ) 3. We shouldnt _in the zoo.A. litter B. letter C. littering二、用所给词的适当形式填空1. My friend uses wood _ (make) a plane for me.2. He should _ (use) the glass bottles.3.We should not _(litter) in the street. 三、连词成
5、句。1. we, reuse, should, water (.)_2. they, plastic, use, to, bags, make(.)_四、完成句子，每空一词。1. 我们不应该砍伐太多的树。 We _ _ _ too many trees.2.我们用木头制成桌子。We _ _ _ _ tables.3.我们应该节约能源,不能浪费。We should_ _，and we cant _ it. 五、句型转换1.We should use too many plastic bottles.（变为否定句）_ 2.We should save water.（改为同义句）We _ _ wat
6、er.3.Should we reuse and save water？（作肯定回答） _4.We should use paper bags.（对划线部分提问） _六、补全对话A. What can I do?B. Its about Earth Day.C. I can draw some pictures on the poster.D. And they should stop cutting down trees.E. On Earth Day, people work together to keep the Earth clean and healthy.David: What
7、are you doing, Simon?Simon: Im making a poster. _David: What is Earth Day?Simon: _David: Thats wonderful! _Simon: We can make a poster together. We can tell people to save the Earth. 4. _David: Yes! _Simon: Good idea! Where do we put this poster?David: We can put it in the classroom. Every student c
8、an see it on Earth Day.七、阅读短文，选择正确答案。 This is the earth. The green part is land. The blue part is sea. The white part is clouds. Our earth is very beautiful and interesting. Many years ago, the earth is very clean. But nowadays there is much pollution on the earth. People are polluting the land, the
9、 water and the air. People must stop doing that. We must protect the earth.（1）The part is land on the earth. A.greenB.whiteC.blue（2）The white part is . A.landB.seaC.clouds（3）Our earth is very . A.cleanB.beautifulC.relaxing（4）But nowadays there is much pollution on the . A.treeB.earthC.land（5）People
10、are polluting . A.the land and the airB.the water and the earthC.the air and the earth【参考答案】一、C A A 二、1. to make 2. use 3. litter三、连词成句。1. We should reuse water. 2. They use plastic to make bags.四、完成句子，每空一词。1.shouldnt cut down 2.use wood to make3.save energy, waste五、1. We shouldnt use too many plastic bottles.2. shouldnt waste3. Yes, you/we do.4. What should you/we do?六、补全对话B；E；A；D；C 七、（1）A（2）C（3）B（4）B（5）A
