2020—2021学年人教版高一英语《主语从句》课件(19张PPT)

主语从句
主语从句在功能上相当于名词
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His job is important.
What he does is important.
His words hurt me.
What he said hurt me .
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什么叫名词性从句？
在句子中起名词作用的句子叫名词从句 (Noun Clauses）
名词从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语等
因此根据它在句中不同的语法功能，名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句
Subject Clauses
主语从句
The definition of subject clause
A sentence functions as subject in a complex sentence is called subject clause.
1. 主语从句：引导词：
1). That Whether
What who whoever which whose
3)Where when how why whenever wherever
That 引导的主语从句
1.That he is a teacher is true.
2.That we failed the exam must frustrate us.
3.That his parents are out of work worries him a lot.
That 引导主语从句时，不充当任何成分，没有任何意义，但不能省略.
Whether 引导主语从句
Whether it is true is not sure.
Whether we will go outing hasn’t been decided.
Whether they will agree is not clear.
Whether 引导主语从句表“是否”之义，不充当句子成分，但不能省略。注意：此时不用if.
what which who whoever引导主语从句
What you said annoyed me yesterday.
Which method is suitable is up to you.
Who will win the game is uncertain.
Whoever wins the competition will be given a present.
这些特殊疑问代词引导主语从句时不变。注意：疑问语序变陈述语序。
where when how why wherever 引导主语从句
1. Where we will go next has been decided.
2.When they will arrive is uncertain.
3.How they solved the problem isn’t known.
4.Why the boy was lost is still a mystery.
这些引导词引导主语从句时不变，从句的语序仍然用陈述句语序。
It 的用法： （形式主语）
It’ possible/important/necessary/clear… that……很可能/重要的是…/必要的是…/很清楚…
It’s said/ reported… that..据说/据报道…
It’s been announced/declared that..已经通知/宣布…
It seems/appears/happens.. that…显然、明显、 碰巧..
It’s no wonder that…并不奇怪/无疑…
It’s a pity/a fact /a common knowledge (众所周知）
/ a common saying….（俗话说）
考点一:主语从句后置!
为了避免主语冗长,句子头重脚轻,经常用it作形式主语,主语从句放在后面作真正的主语.
例:
That we shall be late is certain.
-- It’s certain that we shall be late.
1. That the earth is round is known to all.
--
2. That you missed the chance is a pity.
--
由连词 whether , 连接代词 what,who,which
和连接副词 when,where,why,how 等引导.也
常常后置:
It is a pity that you missed the chance.
It’s known to all that the earth is round.
考点二
注意：主语从句中 ，谓语动词一般用单数
What引导的主语从句，可根据表语决定
What he needs _is_ that book.
What he needs _are_ some books.
what引导名词性从句时在从句中充当句子成分,如主语,宾语,表语,而that则不然,它在句子中只起连接作用。例如：
(1) What you said yesterday is right.
(2) That she is still alive is a puzzle.
What 与 that 引导主语从句
注 意：
What you left are only several old books.
What you said is of great importance.
What he says and does doesn’t concern me.
What he says and does don’t agree.
“if” 不能引导主语从句，应有“whether”引导。
主语从句的 “that” 一般不能省。
“what”引导主语从句时，谓语动词：
1）常与其后的名词作表语一致 2）根据句子的语境而定。
___ he made an important speech at the meeting was true.
A. That B. Why C. What D. How
2. ___we’ll go camping tomorrow depends on the weather .
A If B Whether C That D Where
3.___ is known to us all is that America is a developed country____the First World.
Which; belong to b. As, belonged to
c. What; belonging to d. It; belonging to
4. It’s known to us all ___ a form of energy .
A. water is B. that water is C. is water D. that water to
5. It worried her a bit ___ her hair was turning gray.
A. whether B. that C. what D. when
6.What I say and think ___ none of your business.
A. is B. are C. has D have
7. ______ breaks the law should be punished.
A Whoever B. No matter who C. anyone. D. who
8._______it is right or not remains to be seen.
Whether B.What C.That. D.If
9. _______ is a common saying _____ a friend in need is a friend indeed.
That ,it B. It , that
C. What ,that D. That ,what
Thank you