1、Unit 5 Working the Landdiscover useful structuresWhat Yuan Longping really cared about was not money or celebrity.That Yuan Longping had realised his dream of seawater rice surprised the whole world.It surprised the whole world that Yuan Longping had realised his dream of developing seawater rice.a.
2、A tree has fallen across the road.b.You are a student.c.To find your way can be a problem.d.Smoking is harmful to you.e.What she said is not yet known.f.That we shall be late is certain.例1.When will he come is not known.规律一、主语从句一律用陈述语序，即主语在前，谓语在后。正：When he will come is not known.例2.He will not come
3、to the meetin this evening is true.正：That he will not come to the meeting this evening is true.规律二、连词that 在从句中无实际意义，但不能省略。例3.Which impressed me most is her lovely smiling face.正：What impressed me most is her lovely smiling face.例4.If the meeting will be put off has not been decided yet.正：Whether the
4、 meeting will be put off has not been decided yet.例5.When he will come are a puzzle.正：When he will come is a puzzle.规律五、从属连词that,whether和连接副词when,where,how,why引导的主语从句的谓语动词多用单数第三人称形式。When the meeting will begin _(have)not been decided yet.hasWhen they will start and where they will go _(be)still unkn
5、own.When and where the meeting will begin _(have)not been decided yet.arehas例6 1.What he needs _ that book.2.What he needs _some books.规律六、连接代词规律六、连接代词what，who引导的主语从句，引导的主语从句，可根据表语决定主句动词的单复数形式可根据表语决定主句动词的单复数形式。isare例7 It is uncertain that the experiment is worth doing.注解：一般来说主语从句都是放在注解：一般来说主语从句都是放在
6、,但有时为了使句子但有时为了使句子 ,避免避免”头重脚轻头重脚轻”,常用常用 作作 ，从而把主语从句放在，从而把主语从句放在 句首句首保持平衡保持平衡 it 形式主语形式主语后面后面 It is uncertain whether the experiment is worth doing.规律七、规律七、形式主语句式中主语从句引导词形式主语句式中主语从句引导词不不只只that,还可能是还可能是what,who,whether,when,where,why,how.DCAEBP90 Ex11.Where he had lost the laptop was what we wanted to
7、know.2.How he did the experiment was puzzling to other people.3.Whether they use too many chemical peticides is what I worry about most.4.That the living conditions income of the famers have improved a lot makes people happy.5.When the sports meet will be held has not decided yet.P90 Ex21.What he sa
8、id seems reasonable.2.Whether she will accept the invitation is not clear yet.3.Where the animals are moving to is not exactly known.4.That you have recovered from your illness will be a great relief to us.5.That he has become distant recently is my concern.P90 Ex31.What I have forgotten is that I h
9、ave a test today.2.Who left me these flowers is not clear to me.3.It is obvious that students should prepare well for their future.4.Whose ticket this is has not been confirmed.5.When the test will be given has not decided.P90 Ex41.Whether we can control pests without causing any ill effects still r
10、emains a question.2.It is well known that agriculture is the foundation of our country.3.That some less-developed countries are suffering from food shortages is a serious problem in the world.4.It is true that some herdsmen in Inner Mongolia fix electronic sensors to their cattle to monitor their mo
11、vements.P90 Ex5It is quite common for chemicals to be used in farming and to cause pollution.While many people focus on pesticides,what worries me most is the use of chemical fertilisers.These chemicals easily get into our water supply,and can also have a negative impact on fish and other animals.Wh
12、at is worse,eventually they will reach the ocean,where they cause trouble with the marine environment.There are many areas near the coast where fish can no longer live because of changes in the ocean water,and where different kinds of bacteria and algae grow in such abundance that it is no longer sa
13、fe or even possible to enjoy swimming in the ocean or going to the beach.That farmers are in a hurry to increase their crops and make more money is probably the reason.The solution,I think,is government subsidies for farmers,and research on natural ways to increase crop production.While this is a difficult problem to solve,we can see our way through if we work together.
