高中英语人教版必修3 Unit 4 Astronomy: the science of the stars Period Three　Grammar & Writing 课件

课件29张PPT。Unit 4　Astronomy：the science of the stars语法专题内容索引写作专题Period Three　Grammar & Writing语法专题用适当的连接词完成课文原句
1. it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.
2.The earth became so violent that it was not clear the shape would last or not.
3. is even more important is as the earth cooled down，water began to appear on its surface.主语从句What whetherWhatthat4.It was not immediately obvious water was to be fundamental to the development of life.
5. they suddenly disappeared still remains a mystery.
6.So life will continue on the earth for millions of years to come will depend on this problem can be solved.thatWhywhetherwhether1.主语从句的引导词What we need is more water.(连接代词what在从句中作need的宾语)
我们需要的是更多的水。
Whether we can live on the earth depends on whether the problem is solved.(whether虽不作成分，但有“是否”的意思)
我们能否在地球上生存就取决于这个问题能否得以解决。2.it作形式主语
为保持句子平衡，常把主语从句后置，而用形式主语it代替。it作形式主语时常用于以下句型：It’s possible that he has been to Beijing.
他有可能去过北京。
It’s a pity that you didn’t attend the meeting.
你没参加这次会议太可惜了。1.从句的语序：在任何情况下，主语从句都用陈述语序。
Whoever of you gets here first will get the prize.
你们谁第一个到达这里谁就获奖。
2.主谓一致
(1)从句作主语时，主句的谓语一般用单数形式；但what和who引导主语从句时，有时主句谓语的数应与主句中作表语的名词保持一致。
When we shall have our sports meeting has not been decided.
我们什么时候开运动会还没有确定。
What they need are books.
他们需要的是书。考点警示(2)如果由and连接两个或两个以上的主语从句作主语时，谓语动词用复数；由两个或多个连接词引导一个主语从句时，谓语动词用单数。
When they will start and where they will go have not been decided yet.
他们什么时候动身以及要去哪里还没定下来。
How and why he came to this city is a story of struggle and success.
他为什么及如何来到这个城市是一个充满奋斗和成功的故事。3.whether引导的主语从句，如果用了形式主语it，引导词whether可以换成if。如果whether从句在句首或后面有or not时，不能用if替换。
Whether genetically-modified food does us harm remains to be seen.
＝It remains to be seen whether/if genetically-modified food does us harm.
转基因食物对我们是否有害有待观察。选词填空
① will do it doesn’t matter.
② we cannot get seems better than what we have had.
③It should be considered you come from.
④ the boy asked money from his classmates surprised his teacher.
⑤ I’ll go shopping today depends on whether I am free.题组训练Who Whatwhere WhyWhetherwhat，where，why，whether，who(2)完成句子
① (据报道) some people were killed in the downtown.
②It is clear (他把从商店偷来的钱放哪儿了).
③It appears (她将能在比赛中拿第一名).
④It will make no difference (他是否参加会议).
⑤It remains a mystery (为什么这种动物突然灭绝了).It is reported thatwhere he put the money stolen from the shopthat she will win the first at the matchwhether he will attend the meeting or notwhy this animal died out suddenly用适当的连接词填空
1.Every year， makes the most beautiful kite will win a prize in the Kite Festival.(2017·北京)
2.It is often the case anything is possible for those who hang on to hope.(2016·江苏)
3.Your support is important to our work. you can do helps.
(2016·北京)
4. we understand things has a lot to do with what we feel.(2015·北京)whoeverthatWhateverHow5. Li Bai，a great Chinese poet，was born is known to the public，but some won’t accept it.(2015·江苏)
6.Exactly the potato was introduced into Europe is uncertain，but it was probably around 1565.(2014·大纲全国)
7.I think impresses me about his painting is the colors he uses.
(2014·天津)
8.It remains to be seen the newly formed committee’s policy can be put into practice.(2013·陕西) Wherewhenwhatwhether写作专题写解决问题类作文，一般从以下几个方面展开：
1.提出问题或列出现象，并简要阐述其产生原因；
2.说明其对生活和社会的影响；
3.提出解决问题的方法。
写作时应注意以下四个方面：
1.此类书面表达通常为话题作文或看图作文，大家应仔细研读提示信息或图画，明确应围绕什么问题或现象展开评论。Expository writing:solving a problem2.围绕主题，进行拓展。根据要求和提示信息合理安排篇章中各部分内容，做到详略得当、条理清楚、文字简练。
3.时态：多采用一般现在时，但如果提示中给出了具体时间，学生则应对时态进行相应的调整。
4.要注意存在的问题，分析此问题可能带来的危害，然后针对此问题提出解决方案。1.To start with，...The second reason is...The last but not least reason is...
2.First of all...Secondly，...Thirdly，...Last but not least...
3.Now that the causes for...are organized，some solutions must be made in order to...
4.In my opinion，the best way to solve the problem is...
5.My tips are as follows...
6.The reasons for...can be listed as follows.
7.If I...，here is a problem I might have.
8.Perhaps I would use...假如你是李华，最近收到了你的美国朋友Jenny的来信。她在信中说，由于刚进入高中，还不能适应新的环境，不知道如何去结交新朋友，因而情绪低落。请根据以下内容给她回信，告诉她解决办法。
1.放学后邀请同学一起参加活动；
2.同学遇到麻烦时，去帮助他们；
3.遇到困难时向同学求助。
注意：1.词数80左右；
2.信的开头和结尾已为你写好，不计入总词数。Step One　审题谋篇
写作要求是帮助朋友解决适应环境的问题。写作时应注意下面几点：
1.确定文体：这是解决问题类文章。写作时注意解决问题类作文的写作特点。
2.主体时态：文章应以一般现在时和一般将来时为主。
3.主体人称：由于是指导朋友如何适应环境，所以人称应该以第二人称为主。写作步骤Step Two　联想词汇
1.面对问题
2.改变这种状况
3.邀请某人做某事
4.参加
5.与……交流
6.处于困境
7.交到朋友face the problemchange this situationinvite sb.to do sth.take part incommunicate with...in troublemake friendsStep Three　句式升级
1.听说你进入高中后感觉不好，我真的很抱歉。
I am really sorry to hear that you feel bad after __________________
__________.(after用作连词)
I am really sorry to hear that you feel bad after ________________
______.(after用作介词)you have entered the high schoolentering the highschool2.你的同学也是新生，也面临同样的问题，所以你不必太过担心了。
Your classmates are also new there and face the same problem，so .(there be句型)
Your classmates are also new there and face the same problem，so .(have to)there is no need for you to worry too much about ityou don’t have to worry too much about it3.和别人交流能帮助你们更好地了解彼此。
will help you understand each other better.(不定式作主语)
to communicate with others.(it作形式主语)To communicate with others It will help you understand each other better Dear Jenny，
I am really sorry to hear that you feel bad after entering the high school.Step Four　连句成篇 Your classmates are also new there and face the same problem，so you don’t have to worry too much about it.There is also something that you can do to change this situation.First，try to invite some of your classmates to take part in some activities together after school.It will help you understand each other better to communicate with others.Then，help others when they are in trouble， and ask them to help you when you have difficulty.Soon，I believe，you will make many new friends there.Best wishes!
Yours，
Li Hua本课结束