资源简介

(共20张PPT)
B5U1 Science and Scientists
Grammar： Predicative Clause
一、定义
表语从句是在复合句中作表语的从句，属名词性从句之一。用来进一步对主句的主语进行解释说明，放在连系动词之后，一般结构是“主语+连系动词+表语从句”。可以接表语从句的连系动词有 be, look, remain, seem等。
二、表语从句的连接词
表语从句的连接词分为三类，分别为从属连词（如that, whether/if, because, as if/as though等），连接代词（如who, whom, whose, what, which, whatever, whoever, whichever等）和连接副词（如when, where, why, how等）。
（1)从属连词
1. that 不作句子成分，也没有意义，通常不可省略。
My suggestion is that you should get involved in more leisure activities.
（1)从属连词
2. whether不作句子成分，但有“是否”的意义，一般不用if代替。
The question is whether we can boost the yields.
（1)从属连词
It sounds as if someone is knocking at the door.
（2)连接代词
连接代词在从句中作主语，宾语，表语或定语。
The problem is who can convince Mary to go with us.
（3)连接副词
连接副词在从句中作状语。
This is where he was brought up.
Their difficulty is how they can receive widespread support.
三、表语从句中需要注意的问题
（1）表语从句的特殊句式：
① The reason why.... is that.... （why引导定语从句，修饰the reason, that 引导表语从句）
② This/That/It is because.... (because引导表语从句，从句表原因)
③ This/That/It is why....(why引导表语从句，从句表结果）
Examples
The reason why he didn’t come is that he didn’t receive the invitation.
I’ve got severe diarrhoea. That’s because I ate bad food.
I ate bad food. That’s why I’ve got severe diarrhoea.
三、表语从句中需要注意的问题
（2）as if/as though引导的表语从句的语气：
as if/as though引导的表语从句常置于连系动词look， seem, appear, sound, feel, taste, feel, smell等后。
若表述正式的情况或极有可能发生的情况，就用真实的语气。若表述与客观事实相反的假设，就用虚拟语气。与现在事实相反，用一般过去时（be动词一律用were）；与过去事实相反，用过去完成时。
Examples
It seems as if he benefits a lot from the project.(真实语气)
It looks as if/as though he were drunk.(虚拟语气)
三、表语从句中需要注意的问题
（3）表语从句中的虚拟语气：
主语时表示“建议，命令，要求”的名词，如suggestion, advice, proposal, order, command, request, requirement, demand等时，表语从句应使用虚拟语气，即从句谓语用should+动词原形，should可以省略。
Examples
My suggestion is that we (should) set off early tomorrow.
His order was that the handle of the water pump (should) be removed.
三、表语从句中需要注意的问题
（4）表语从句一定要用陈述语序：
The question remains whether they will be able to help us.
Exercises
1. This is _____my father has taught me —— to always face difficulties and hope for the best.
2. The trouble is _____I am anxious to find my microscope, but it is nowhere to be found.
3. Peter shows me that what matters is _____you convey your own passion so that you excite other people.
what
that
how
Exercises
4. What the doctors really doubt is ________the infection can be brought under control.
5. The reason ____he felt frustrated was ____he didn’t attain his goal.
6. My suggestion is _____we should try our best to make our dream become a reality.
whether
why
that
that
Exercises
7. The key is _____________I can find a vegetable oil rich in essential fatty acids.
8. The doctor’s advice is _______you should build up your strength.
9. The question is _____will come to help us overcome the difficulty.
where/whether
that
who
Exercises
10. Yesterday’s game is ______makes me feel frustrated.
11. See the sorghum and wheat in the bags That was ____we did this morning.
12. Without his support, we couldn’t be _____we are now.
what
what
where
Exercises
13. Chinese New Year is a celebration marking the end of the winter season and the beginning of spring. This is ____decorating with plants, fruits and flowers carries special significance.
14. The problem we are faced with is____we can decrease the spread of the virus.
15. What I can’t understand is _____the number of new students in our school has decreased.
why
how
why

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