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③ 关联词只能用 whether或if, 不能用 that的情况如下：
若doubt一词作“怀疑”解接宾语 从句时, 主句为肯定句用whether或if, 主句为否定句或疑问句用that。如：
I doubt whether he will come soon.
I do not doubt that he will come soon. Do you doubt that he will come soon 注意: 下面这个例句中doubt的含义为 “认为……未必可能”。 I doubt that he will come.
1. 概念 在句子中起名词作用的句子叫名词性从句
(Noun Clauses)。 名词性从句的功能相当于 名词词组, 它在复合句中能担任主语、宾语、 表语、同位语、介词宾语等, 因此根据它在 句中不同的语法功能, 名词性从句又可分别 称为主语从句(Subject Clause)、宾语从句 (Object Clause)、表语从句(Predicative Clause) 和同位语从句(Appositive Clause)。
从属连词that, whether, if 连接代词 who, whom, whose, which, what 连接副词 where, how, why, when
He has got a pen. I think… I think (that) he has got a pen. Where do they study English? Lily asks… Lily asks where they study English. Will you help me? I ask… I ask if you will help me.
3. 不可省略的连词： 1) 介词后的连词 2) 引导主语从句和同位语从句的连
词不可省略。 That she was chosen made us very happy. We heard the news that our team had won.
Noun clause
Subject Clause (主语从句) Object Clause (宾语从句) Predicative Clause (表语从句)
② 关联词if, whether均可使用的情况如 下：
A) 引导宾语从句。如： I wonder if (whether) the news is
true or not. B) 在 “be+形容词” 之后。如：
He was not sure whether (if) it is right or wrong.
四、it作形式主语和it引导强调句的比较 it作形式主语代替主语从句, 主要是为
了平衡句子结构, 主语从句的连接词有变 化。而it引导的强调句则是对句子某一部 分进行强调, 无论强调的是什么成分, 都可 用连词that。被强调部分指人是也可用 who/whom。例如:
It is a pity that you didn’t go to see the film.
4. 跟在介词后的宾语从句: 宾语从句放 在介词后作介词的宾语, 在使用这种结 构时不能丢掉介词。
There is no news about whether a new bridge will be built.
We are considering of where these trees should be planted.
C) 在介词之后。(介词往往可以省略) 如: It all depends (on) whether they will
support us. D) 后面直接跟动词不定式时。如：
He doesn’t know whether to stay or not. E) 后面紧接or not 时。如：
We didn’t know whether or not she was ready.
Mary wrote an article on ___ the
team had failed to win the game.
A. why
B. what
C. who
D. that
I was surprised by her words,
which made me recognize ___
silly mistakes I had made.
子成分, 如主语、宾语、表语, 而that则不 然, 即不担任成分。例如：
What you said yesterday is right. That she is still alive is a consolation.
宾语从句的用法
句子结构： 主句 + 连接词(引导词) + 宾语从句 连接词:
人教课标版 高二 选修 8 Unit 1
Grammar
Look at the following clauses in the sentences and think about what role do these clauses play in the sentences. •What attracts people to California is its pleasant climate and relaxed lifestyle. 主语 •This is why each year a great number of people from all over the world try to immigrate to California. 表语 •However, most applicants know that they have very little chance of getting a visa.宾语
注意: 连词that, whether在从句中不担任 句子成分, 只起连接作用, 不能省略 (注: if不可用来引导主语从句）
二、用it 作形式主语的结构 (1) It is＋名词＋从句
It is a fact that … 事实是…… It is an honor that ……非常荣幸 It is common knowledge that…是常识 (2) It is＋形容词＋从句 (多用 should) It is natural that… 很自然…… It is strange that… 奇怪的是……
It doesn’t interest me whether you succeed or not.
It is in the morning that the murder took place.
It is John that broke the window.
五、what与that在引导主语从句时的区别 what引导主语从句时在从句中充当句
注意: ① 关联词只能用whether不能用if 表示 “是否”的情况如下：
A) 在表语从句和同位语从句中。如： The question is whether the film is
worth seeing. The news whether our team has
won the match is unknown.
2. 当宾语从句是特殊疑问句时, 由特殊 疑问词充当连接词, 因为该特殊疑问 词 (即连接词) 在从句中担任一定的 句子成分, 具有一定的意义, 所以不 可以省略。
Do you know what he said just now? I don’t remember when we arrived. I asked him where I could get so much money. Please tell me who we have to see. Do you know what time the plane leaves?
三、用带-ever的引导词 (如whoever, whatever) 引导的主语从句一般不后置。
Whoever leaves the room last should close the door.
Whatever we do must be in the interests of the people.
spread all over the world.
同位语从句
2. 引导名词性从句的连接词可分为三类: 连接词/从属连词that, whether, if 不充 当从句的任何成分 连接代词: what, whatever, who, whoever, whom, whose, which. 连接副词: when, where, how, why
What he wants to tell us is not clear.
主语从句
I believe (that) he is honest.
宾语从句
The question is who (which of you) will be
the next speaker.
表语从句
The news that he had landed on the moon
A. what
B. that
C. how
D. which
3. 当宾语从句是一般疑问句时, 由连词 whether或if引导(口语中常用if), 因为 if/whether翻译成是否, 具有一定的意 义, 所以不能省略。 Lily wanted to know if /whether her grandma liked the handbag. Let’s see if /whether we can find out some information about that city.
(3) It is ＋ 不及物动词＋从句 It seems that… 似乎…… It happened that… 碰巧…… It appears that… 似乎……
