六上U7知识点.doc

Unit Seven【语法】情态动词初了解情态动词本身有一定的词义，但不能单独使用，必须与后面的动词原形（行为动词、系动词）构成句子的谓语，情态动词无人称和数的变化。常见的情态动词有： can (could ), may ,must ,have to ,shall(should), will(would)等。 现在一起来了解下含情态动词的各种句式：（1）肯定句结构： 主语+情态动词+动词原形+其他如： You should read books now.你现在应该看书了。（2）否定句结构：主语+情态动词+not+动词原形+其他如：We shouldnt waste energy.我们不应该浪费能源。（3）一般疑问句结构： 情态动词+主语+动词原形+其他？如：Shall we go to the library now? 我们现在去图书馆好吗？ Good idea. 好注意。（4）特殊疑问句机构：特殊疑问词+情态动词+主语+动词原形+其他？如： What should we do now? 我们现在应该做什么？ We should wait for our parents. 我们应当等我们的父母。【语言知识点】1. We use water to clean things. 我们使用水洗东西 use sth to do sth使用某物做某事eg. We use wood to make chairs.我们用木头做椅子。同样，我们也可以说：reuse sth to do sth. 再利用某物做某事。例如：I can reuse paper to make a box. 我能再利用纸来做一只盒子。I can reuse a plastic bottle to make a toy. 我能再利用一只塑料瓶做一玩具。2. We should save water. 我们应该节约水。 We shouldnt waste water.我们不应浪费水。情态动词should表示“应该”，shouldnt表示“不应该”。其后要跟动词原形。例如：We shouldnt play football in the street. 我们不应该在街上踢足球。You should get up early. 你应该早点起床。3. Most of our energy comes from coal and oil.我们大多数能源来自煤炭和石油。 come from 的意思是“来自”，它相当于be from。例如：Jack comes from the US.= Jack is from the US.杰克来自美国Where are you from? = Where do you come from? 你从哪儿来？4. We should not drive so much because cars use a lot of energy. We should not cut down too many trees because trees help keep the air clean.We should not use too many plastic bags or bottles. Too much plastic is bad for the Earth. In many places, there is not much water. There is not much coal or oil on Earth.We use wood to make tables, chairs and many other things.many和much的区别：从以上句子可以看出：many后跟可数名词复数，much 后跟不可数名词，例如：He has many friends here. 他在这儿有许多朋友。He has much work to do. 他有许多工作要做。与many 和much相关的短语有：so many/ so much 这么多， too many/ too much 太多How many/ How much? 多少？例如：He eats so much every day. 他每天吃这么多。Dont eat too much for supper. Its bad for your health. 晚饭别吃太多，对你的身体不好。How much milk is there in the fridge? 冰箱里还有多少牛奶？I dont want so many boxes. 我不需要这么多箱子。There are too many cars on the road. 马路上有太多的车子。How many birds can you see in the tree? 你能看到树上有多少只鸟？35. Too much plastic is bad for the Earth. 太多的塑料对地球有害。be bad for对有害，对不好，相反的就是be good for.对有好处，例如： Watching too much TV is bad for your eyes. 电视看得太多对眼睛不好。 Eating fruit is good for your health. 吃水果对身体有好处。6. Lets make a poster and tell them about it.让我们做张海报告诉他们关于它。tell sb about sth的意思是：告诉某人有关某事，例如：The teacher is telling the students about the Earth. 老师正在告诉学生有关地球的知识。Did you tell him about the party? 你把聚会的事情告诉他了吗？7. Let me draw some bananas on the trees. 让我在树上画一些香蕉。on the tree 在树上。强调是长在树上。如果要表示外来物在树上则用in the tree。例如：Look, there is a kite in the tree. 看，树上有一只风筝。Can you pick the oranges on the tree? 你能摘到树上的橘子吗？8. 知识了解让学生知道每年的4月22日为“世界地球日”；每年的6月5日为世