1、Unit 6 Keep our city clean 第2课时 Grammar time知识点一 What makes dirty/messy ?【知识精讲】What makes dirty/messy ?什么使变脏/乱？答语一般为： makes/make dirty/messy.如：What makes the air dirty? 什么使空气变脏？ Smoke makes the air dirty. 烟雾使空气变脏。【经典例题】Rubbish makes the streets dirty. （就划线部分提问）_【名师解析】句意：垃圾使街道变脏。划线部分为“垃圾”，所以应该问“什么使街道
2、变脏？”所以答案为What makes the streets dirty?知识点二 What can we do to ?【知识精讲】What can we do to ?我们怎样做能？不定式to do 表示目的，意为“为了”。答语一般用We can. 我们可以。如What can we do to make our city clean ? 我们可以做什么保持我们的城市干净？We can take the bus and the metro to school. 我们可以乘公共汽车和地铁上学。【经典例题】完成句子我们可以做什么保持我们的学校干净？_ _ we do_ _ our schoo
3、l clean ? 【名师解析】根据给出的信息可知，横线部分缺少“可以做什么”和“（为了）保持”，不定式to do 表示目的，所以答案为What can；to make。知识点三 特殊疑问句：“能/可以/会做什么?”【知识精讲】询问“能/可以/会做什么?”使用句型：特殊疑问词What+can +主语+动词原形+其他？如:What can you do? 你会做什么？【经典例题】We can ride bikes to school.(就划线部分提问)_【名师解析】句意：我们可以骑自行车上学。划线部分为“骑自行车上学”，所以应该提问“你们可以做什么？”所以答案为What can you do?
4、知识点四 情态动词can 【知识精讲】can 是情态动词，没有人称和数的变化，它后面的谓语动词必须用原形。肯定句：主语+ can +动词原形+ 其他。 如：He can fly a kite. 他会放风筝。否定句：主语+cant +动词原形+其他。 如：She cant play football. 她不会踢足球。一般疑问句：Can +主语+动词原形 +其他其肯定回答是：Yes,can .否定回答是：No, cant. 如： Can you play chess? 你会下棋吗？ Yes, I can ./No, I cant.是的，我会。/ 不，我不会。【经典例题】My brother can
5、 _ (cook) nice food.【名师解析】can 是情态动词，没有人称和数的变化，它后面的谓语动词必须用原形。所以填cook。课时小练五、首字母填空1. Black smoke m_the air dirty.2. What can we do to make our city c_？六、阅读理解阅读短文, 判断正误。 Now our city becomes much greener. A lot of trees, grass and flowers were planted on both sides of the streets. There are a lot of adv
6、antages (好处) because of them. First, trees, grass and flowers can make our city more beautiful. Second, they can keep the air clean because they absorb carbon dioxide (吸收二氧化碳). Third, they can reduce (减少) the noise. Finally, trees can make the weather cool in summer and warm in winter. Then how to m
7、ake our city greener? First, we should plant more trees, grass and flowers. Then, we should look after the planted trees, grass and flowers carefully.（1）A lot of trees, grass and flowers were planted in our city. （2）Flowers can make our city more beautiful. （3）The air is second. （4）It is important to make our city greener. （5）We shouldnt plant more trees, grass and flowers. 【参考答案】二、makes walks factories Was takesweep claeaning三、AAC AAB五、makes; clean六、TTFTF
