人教版(2019)选择性必修第一册Unit 5 Working the Land Grammar课件(13张ppt)

(共13张PPT)
Unit5 Grammar
探究发现
①However,what concerned him most was that farmers often had poor harvests and sometimes even had a serious shortage of food to eat.
②How this could be done was a challenging question at the time.
③However,whether it was possible to develop a hybrid of self pollinating plants such as rice was a matter of great debate.
④Today,it is estimated that about 60 percent of domestic rice consumption in China is comprised of crops generated from Yuan's hybrid strains,and his strains have allowed China's farmers to produce around 200 million tonnes of rice per year.
⑤ What impressed people most about Yuan Longping was his ongoing ability to fulfil his dreams.
[我的发现]
(1)以上红体部分在句中作________
(2)①⑤句中的what在从句中作_________
(3)②句中的how在从句中作__________
③句中的whether意为：_______
(4)④句中it是 __________, 正真的___________ 是后面的that引导的从句。
主语
主语
状语
是否
形式主语
主语
一、定义
在主从复合句中用作主语的从句叫主语从句。
What made people excited was that the solarship had completed an around-the-world trip.
让人们激动的是太阳能船已完成了环游世界的旅行。
It worried the mother that her son was always playing computer games.
她的儿子一直在玩电脑游戏，这让这位母亲很担心。
要点规则详析
分解
1.连接词that和whether/if
(1)that引导主语从句时，在从句中不充当任何句子成分，也没有实际意义，只起连接作用，但不可省略。
That she survived the accident is a miracle.
她在事故中幸免于难简直是个奇迹。
(2)whether/if引导主语从句时，在从句中不充当任何句子成分，起连接作用，意为“是否”，不可省略，有时也可用t作形式主语代替。
Whether the plan will be carried out is still unknown.
=It is still unknown if/whether the plan will be carried out.
这个计划是否会实施还不知道。
[名师点津]whether引导的主语从句既可放在句首也可放在句尾，但if引导的主语从句不可以位于句首，可用it作形式主语，if引导的从句后置作真正主语。
二、主语从句的连接词及其句法功能
①____________________________ made us very happy.
她能来帮助我们使我们很高兴。
② _____________________________doesn't matter too much.
她来不来都无关紧要。
即使训练 1 补全对话
That she could come to help us
Whether she is coming or not
Whichever (of you)comes in first will receive a prize.
无论（你们）谁先到都可以得到奖品
Who will go to the concert is not known
不知道谁会去听音乐会。
Whatever you do in your spare time should do no harm to others.
无论你在业余时间做什么，都不应该伤害其他人。
名师点津who引导的主语从句表示一件事情，而whoever引导的主语从句指人。
2. 连接代词(who,whose,whom,what,which,whichever,whoever, whomever,whatever)连接代词引导主语从句，在从句中可以作主
语、宾语、表语或定语。
How this happened is not clear to anyone.
这件事是怎样发生的，谁也不清楚。
When we will have a meeting is an important question.
我们何时举行会议是个重要的问题
Where I spend my summer vacation is no business of yours.
我在哪里过暑假不关你的事。
[名师点津]名词性从句引导词的确定步骤：
(1)分析句式结构，明确名词性从句在句中的功能；
(2)明确名词性从句所表达的意义；
(3)明确名词性从句中所需要的成分及意义； (4)确定从句的引导词
3.连接副词(when,where,how,why,whenever,wherever,however等)连接副词引导主语从句并在从句中作状语。
①(2017，北 京高考)Every year,________makes the most beautiful kite will win a prize in the Kite Festival.
②(20l6·北京高考)Your support is importantto our work. _________ you can do helps.
③ _____ we understand things has a lot to do with what we feel.
④ __________ Li Bai,a great Chinese poet, was born is known to the public,but some won't accept it.
⑤______ John was late for the class has been unexplained.
⑥________ part of the country he will travel to needs discussing.
⑦__________ the English party will be held has not yet been decided.
⑧_________ surprises me most is that he is too proud.
[即时训练2]用适当的连接代词或连接副词填空
whoever
Whatever
How
Where
Why
Which
Where/When
What
l.It+be+形容词(obvious,true,natural, strange等)+主语从句.
It is important that he should know about this 他应该知道此事是重要的
[名师点津]在“It十be十形容词十主语从句.”结构中，若形容词为important/necessary/ strange等，主语从句中的谓语用“should+动词原形”形式，其中should可省略
2.It+be十名词词组(no wonder,an honour,a pity,a/no surprise等)+主语从句.
It's a pity that he didn't come. 很遗憾他没来。
3.It+be+过去分词(said,reported,thought,expected,proved等)十主语从句
It is suggested that the meeting be put off. 有人建议会议延期召开。
[名师点津]在“It十be十过去分词十主语从句.”结构中，过去分词若为suggested/.ordered/
required/advised等，主语从句中的谓语用“should十动词原形”形式，其中should可省略。
4.It十不及物动词(happen,occur等)十主语从句
It happens that his sister is my good friend. 碰巧他姐姐是我的好朋友。
5.It十及物动词十宾语+主语从句。
It surprised him why they came to visit him suddenly. 让他吃惊的是他们为什么突然都来看他：
三、主语从句中用t作形式主语的结构
①(2020·江苏本考)It is not a problem _______________ the battle;it's just a matter of time.
我们能否打赢这场战斗不是问题，这只是时间问题。
②(20l6·江苏高考)It is often the case _____________________ for those who hang on to hope.
通常情况下，对于那些心存希望的人，一切皆有可能。
③_____________ that the old man should go to the countryside to have a rest.
建议这位老人到乡村休息一下。
④_______________ that you disagree with the plan.
在我看来，你好像不赞成这个计划。
⑤_________________ the harvest was bad that year.
碰巧那年收成不好。
即使训练3 （1）补全句子
whether we can win
that is anything is possible
It’s suggested
It seems to me
It happened that
⑥That he suddenly fell ill last month surprised us.
___________________ he suddenly fell ill last month.
⑦Whether they will sell the house hasn't been yet decided.
__________________________________they will sell the house.
⑧That light travels in straight lines is known to us all.
_______________________ light travels in straight lines.
即使训练3 （2）句型转换
It surprised us that
It hasn’t been decided yet whetyher
It is known to us all that
1.从句要用陈述语序
What we will do next should be decided. 应该决定一下我们下一步该做什么。
2.主谓一致 (1)从句作主语时，主句的谓语一般用单数形式。
Where he will get a job after graduation has puzzled him much. on
毕业后到哪儿找份工作使他很困惑
[名师点津]what引导主语从句时，如果主句包含“be动词十名词”，
be动词应与主句中作表语的名词保持一致。
What the school needs most are books. 这所学校最需要的是书。
(2)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.
他们将在什么时候动身以及要去哪里还没定下来。
When and where they will hold the meeting is not clear.
他们何时何地召开会议还不清楚
四、主语从句中应注意的问题
①What surprised me most ______(be) that the man in rags was a millionaire.
②What he needs most ____ (be) money.
③When and where the meeting will be held _______________ (decide) already.
④That the coal workers are still alive _____(be)a wonder
即使训练4 用所给词的适当形式填空
was
is
has been decided
is