高中英语语法之名词性从句

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 宾语从句 表语从句和同位语从句 一 引导名词性从句的连接词 引导名词性从句的连接词可分为三类 连词 that 无任何词意 whether if 均表示 是否 表明从句内容的不确定性 as if as though 均表示 好 像 似乎 以上在从句中均不充当任何成分 连接代词 what whatever who whoever whom whose whichever whomever 连接副词 when where how why how many how much how often 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 比较 whether 与 if 均为 是否 的意思 但在下列情况下 只可用 whether 1 whether 引导主语从句并在句首 2 引导表语从句 3 whether 从句作介词宾语 4 从句后有 or not Whether he will come is not clear 大部分连接词引导的主语从句都可以置于句末 用 it 充当形式主语 It is not important who will go It is still unknown which team will win the match 二 主语从句 1 作句子主语的从句叫主语从句 主语从句通常由从属连词 that whether if 和连接代词 what who which whatever whoever 以及连接副词 how when where why 等词引导 that 在句中无词义 只起连接作用 连接代词和连接副词在句中既保留自己的疑问含义 又起连接作用 在从句中充当从句的成分 例如 What he wants to tell us is not clear 他要跟我们说什么 还不清楚 Who will win the match is still unknown 谁能赢得这场比赛还不得而知 It is known to us how he became a writer 我们都知道他是如何成为一名作家的 Where the English evening will be held has not yet been announced 英语晚会将在哪里举行 还没有宣布 有时为避免句子头重脚轻 常用形式主语 it 代替主语从句作形式主语放于句首 而把主语从句置于句末 主语 从句后的谓语动词一般用单数形式 常用句型如下 1 It be 名词 that 从句 2 It be 形容词 that 从句 3 It be 动词的过去分词 that 从句 4 It 不及物动词 that 从句 另注意在主语从句中用来表示惊奇 不相信 惋惜 理应如此等语气时 谓语动词要用虚拟语气 should do 常用的句型有 It is necessary important natural strange etc that It is suggested requested proposed desired etc that 2 第一部分 常规主语从句 即句子在复合句中充当一个主语 主语从句的时态 不受主句的时态影响和限制 1 That he finished writing the composition in such a short time surprised us all 2 Whether we will go for an outing tomorrow remains unknown 3 Who will be our monitor hasn t been decided yet 4 Whom we must study for is a question of great importance 5 What caused the accident remains unknown 6 Whatever you did is right 7 Who the watch belongs to was lost is unknown 8 What we need is time 9 What we need are good doctors 小结 1 引导主语从句连词有 that whether who what whatever 等 2 连词位于句首不能省略 3 主语从句大多数 情况下视为三单 但也有例外 如例 9 第二部分 为了防止句子头重脚轻 通常把形式主语 it 放在主语位置 真正主语搁置于句末 1 It is certain that he will win the match 2 It is true that he has made a very important discovery in chemistry 3 It is very likely that they will hold a meeting 4 It is strange that he should do that 5 It is important that we all should attend the meeting 6 It is strange that the man should have stuck to his silly ideas 7 It is a pity that we won t be able to go to the south to spend our summer vacation 8 It is still a mystery what caused the accident 9 It is said that he has gone to shanghai He is said to have gone to shanghai 10 It is known to all that the gun powder was first invented by the Chinese 11 It is suggested that the work should be done with great care 12 It seems that he has seen the film He seems to have seen the film 13 It happened that the two cheats were there The two cheats happened to be there 小结 1 以 that 引出的主语从句 常以形式主语 it 引导 It is 形容词 名词 某些动词 ed that 从句 2 在有些 that 从句中要用虚拟语气 should do should have done 例句 4 5 6 11 3 主语从句的用法 主语从句是在复合句中充当主语的从句 通常放在主句谓语动词之前或由形式主语 it 代替 而本身放在句子末 尾 1 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 主语从句的连接词没有变化 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 2 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 It is natural that 很自然 It is strange that 奇怪的是 3 it 不及物动词 从句 It seems that 似乎 It happened that 碰巧 4 it is 过去分词 从句 It is reported that 据报道 It has been proved that 已证实 3 主语从句不可位于句首的五种情况 1 if 引导的主语从句不可居于复合句句首 2 It is said reported 结构中的主语从句不可提前 例如 It is said that President Jingo will visit our school next week 3 It happens It occurs 结构中的主语从句不可提前 例如 It occurred to him that he failed in the examination 4 It doesn t matter how whether 结构中的主语从句不可提前 例如 It doesn t matter whether he is wrong or not 5 含主语从句的复合句是疑问句时 主语从句不可提前 例如 Is it likely that it will rain in the evening 4 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子成分 如主语 宾语 表语 而 that 则不然 例如 What you said yesterday is right 三 宾语从句 名词句用作宾语的从句叫宾语从句 引导宾语从句的关联词与引导主语从句表语从句的关联词大致一样 在句 中可以作谓语动词或介词及非谓语动词的宾语 1 由连接词 that 引导的宾语从句 由连接词 that 引导宾语从句时 that 在句中不担任任何成分 在口语或非正式的文体中常被省去 但如从句是 并列句时 第二个分句前的 that 不可省 例如 He has told me that he will go to Shanghai tomorrow 他已经告诉我他明天要去上海 We must never think that we are good in everything while others are good in nothing 我们决不能认为自己什么都好 别人什么都不好 注意 在 demand order suggest decide insist desire request command 等表示要求 命令 建议 决定等意 义的动词后 宾语从句常用 should 动词原形 例如 I insist that she should do her work alone 我坚持要她自己工作 The commander ordered that troops should set off at once 司令员命令部队马上出发 2 用 who whom which whose what when where why how whoever whatever whichever 等关联词引导的宾语 从句相当于特殊疑问句 应注意句子语序要用陈述语序 例如 I want to know what he has told you 我想知道他 告诉了你什么 She always thinks of how she can work well 她总是在想怎样能把工作做好 She will give whoever needs help a warm support 凡需要帮助的人 她都会给予热情的支持 3 用 whether 或 if 引导的宾语从句 其主语和谓语的顺序也不能颠倒 仍保持陈述句语序 此外 whether 与 if 在作 是否 的意思讲时在下列情况下一般只能用 whether 不用 if a 引导主语从句并在句首时 b 引导表语从句时 c 引导从句作介词宾语时 d 从句后有 or not 时 e 后接动词不定式时 例如 Whether there is life on the moon is an interesting question 月球上有没有生命是个有趣的问题 The question is whether she should have a low opinion of the test 现在的问题是她是否应该有一个低意见的测试 Everything depends on whether we have enough money 一切要看我们是否有足够的钱 I wonder whether he will come or not 我想知道他来还是不来 Can you tell me whether to go or to stay 你能否告诉我是去还是留 4 注意宾语从句中的时态呼应 当主句动词是现在时 从句根据自身的句子情况 而使用不同时态 例如 he studies English every day 从句用一般现在时 he studied English last term 从句用一般过去时 I know that he will study English next year 从句用一般将来时 he has studied English since 1998 从句用现在完成时 当主句动词是过去时态 could would 除外 从句则要用相应的过去时态 如一般过去时 过去进行时 过去 将来时等 当从句表示的是客观真理 科学原理 自然现象 则从句仍用现在时态 例如 The teacher told us that Tom had left us for America 5 think believe imagine suppose 等等动词引起的否定性宾语从句中 要把上述主句中的动词变为否定式 即将 从句中的否定形式移到主句中 例如 We don t think you are here 我们认为你不在这 I don t believe he will do so 我相信他不会这样做 6 时态 1 主句用一般现在时 从句可用任意时态 2 主句用过去时 从句用过去某个时态 3 主句用过去时 从句是客观真理时 只用一般现在时 7 宾语从句的连接词 从属连词 连接宾语从句的从属连词主要有 that if whether that 引导表示陈述句的宾语从句 而 if 和 whether 引导 表示 是否 的宾语从句 He told me that he would go to the college the next year 他告诉我他明年上大学 I don t know if there will be a bus any more 我不知道是否还会有公交车 Nobody knew whether he could pass the exam 没人知道他是否会通过考试 连接代词 连接代词主要有 who whom whose what whoever whomever whosever whatever whichever 等 连接 代词一般指疑问 但 what whatever 除了指疑问外 也可以指陈述 Do you know who has won Red Alert game 你知道是谁赢得了红色警报的游戏 The book will show you what the best CEOs should know 这本书会告诉你最好的执行总裁该了解些什么 Have you determined whichever you should buy a Motorola or Nokia cell phone 你决定好是买诺基亚还是摩托罗拉的电话了吗 连接副词 连接副词主要有 when where why how whenever wherever however 等 He didn t tell me when we should meet again 他没有告诉我什么时候我们能再见面 Could you please tell me how you use the new panel 你能告诉我怎么用这个新的操作盘吗 None of us knows where these new parts can be bought 没有人知道这些的新的零件能在哪里买到 8 动词的宾语从句 大多数动词都可以带宾语从句 We all expect that they will win for members of their team are stronger 我们都预料他们会赢 因为他们的队员更强壮 He told us that they would help us though the whole work 他告诉我们在整个工作中 他都会帮忙的 部分 动词 副词 结构也可以带宾语从句 I have found out that all the tickets for the concert have been sold out 我发现这场音乐会的所有票都卖光了 Can you work out how much we will spend during the trip 你能计算出这次旅行我们将花费多少钱吗 动词短语也可以带宾语从句 常见的这些词有 make sure 确保 make up one s mind 下决心 keep in mind 牢记 Make sure that there are no mistakes in your papers before you turn them in 在上交试卷前确保没有任何错误 可运用形式宾语 it 代替的宾语从句 动词 find feel consider make believe 等后面有宾语补足语的时候 则需要用 it 做形式宾语而将 that 宾语从句后置 I think it necessary that we take plenty of hot water every day 我认为每天多喝开水是有必要的 I feel it a pity that I haven t been to the get together 我没去聚会 感觉非常遗憾 I have made it a rule that I keep diaries 我每天写日记成了习惯 We all find it important that we should make a quick decision about this mater 我们都认为对这件事马上做出决定很重要 有些动词带宾语从句时需要在宾语与从句前加 it 这类动词主要有 hate take owe have see to I hate it when they with their mouths full of food 我讨厌他们满嘴食物时说话 He will have it that our plan is really practical 他会认为我们的计划确实可行 We take it that you will agree with us 我们认为你会同意我们的 When you start the engine you must see to it that car is in neutral 开启发动机时 一定要使汽车的离合器处于空挡位置 若宾语从句是 wh 类 则不可用 it 代替 We all consider what you said to be unbelievable 我们都认为你所说的是不可信的 We discovered what we had learned to be valuable 我们发现我们所学到的东西都是有用的 9 介词的宾语从句 用 wh 类的介词宾语从句 We are talking about whether we admit students into our club 我们正在讨论是否让学生加入我们的俱乐部 The new book is about how Shenzhou 6 manned spaceship was sent up into space 这本新书是关于神州 6 号载人航天飞船是如何升入太空的 用 that if 引导的介词宾语从句 有时候 except but besides 三个介词后可见到 that 引导的宾语从句 I know nothing about my new neighbor except that he used to work with a company 对于我的新邻居我只知道他曾在一家公司上班 其他一无所知 10 形容词的宾语从句 常用来引导宾语从句的形容词有 sure certain glad please happy sorry afraid satisfied surprised I am sure I will pass the exam 我确信我会通过考试 I am sorry that I have troubled you so long 很抱歉我这么长时间在打扰你 He is glad that Li Ming went to see him when he was ill 他很高兴在他生病的时候李明能去看望他 11 if whether 在宾语从句中的区别 if 和 whether 在作 是否 解时 引导宾语从句常放在动词 know ask care wonder find out 等之后 介词后一般不 用 if 少数动词 如 leave put discuss doubt 后的宾语从句常用 whether whether 后可以加 or not 但是 if 不可以 在不定式前只能用 whether 如 I can t decide whether to stay 我不能决定是否留下 避免歧异时 我 们常用 whether 而不用 if 12 哪些宾语从句不可以省略引导词 that 1 当 that 作 learn suggest explain agree wonder prove mean state feel hold 等动词的宾语时 2 当宾语从句较长时 3 当 主语状语置于主句尾 宾语从句之前时 4 当主语谓语动词 包括非谓语动词 与宾语从句之间有插入语时 5 当一个 动词带有两个或两个以上宾语从句时 此时第一个 that 可以省略 第二个 that 不可以省略 6 当宾语从句中的主语是 this that 或 this that 做主语的定语时 7 当宾语从句是双宾语中的直接宾语时 当宾语从句的主语是非谓语动词或主 语从句时 8 当主语中的谓语动词是固定词组时 9 当宾语从句有 it 做其先行词时 10 在直接引语中 转述分句把宾 语从句隔开时 13 宾语从句的否定转移 主句的谓语动词是 think believe imagine suppose consider espect fancy guess 等 并且主句的主语是第一人称而且为 一般现在时 从句的否定词一般要转移到主句上来 其反义疑问句一般与宾语从句一致 I don t think he will come to my party 而不能说成 I think he won t come to my party 我认为他不会来我的舞会 I don t believe that man is killed by Jim is he 我认为那个人不是 Jim 所杀的 是不是 如果宾语从句中有某个含有否定意义的形容词或副词 其反义疑问句要用肯定形式 We find that he never listens to the teacher carefully does he 我们发现他从来不仔细听老师讲课 是不是 14 宾语从句的时态和语序 当主句为现在时或将来时 宾语从句的时态一般不受主句的时态所影响 当主句为过去时 从句用一般过去时或过去进行时表示与主句谓语动词动作同时发生 I only knew he was studying in a western country but I didn t know what country he was in 我只知道他当时在西方的一个国家读书 可不知道是哪个国家 He asked me if I was reading the story The Old Man and the Sea when he was in 他问我他进来的时候我是否正在读 从句过去完成时表示该动作发生在主句谓语动作之前 He told me that he had told Mary about the meeting already 他告诉我他已经把有关会议的事情告诉的了 Mary 从句谓语用过去将来时表示该动作发生在主句谓语动作之后 The reporter asked if the government would take necessary measures to put down the to do 记者问政府是否会采取必要的措施镇压骚乱 如果从句是一个客观真理 那么从句的时态不根据主句的时态而变化 The teacher said that the moon goes around the earth yesterday 老师昨天说月亮绕着地球转 当宾语从句的引导词是 who which what when where how why 等表疑问时 不能按正常语序安排 经常将这类引导 词置于句首 Who do you think the public might choose as their favorite singer this year 你认为今年公众会选谁为他们最喜欢的歌手 四 表语从句 1 在句中作表语的从句叫表语从句 引导表语从句的关联词与引导主语从句的关联词大致一样 表语从句位于 连系动词后 有时用 as if 引导 其基本结构为 主语 系动词 that 从句 例如 The fact is that we have lost the game 事实是我们已经输了这场比赛 That s just what I want 这正是我想要的 This is where our problem lies 这就是我们的问题所在 That is why he didn t come to the meeting 那就是他为什么不到会的原因 It looks as if it is going to rain 看上去天要下雨了 需要注意的 当主语是 reason 时 表语从句要用 that 引导而不是 because 例如 The reason why he was late was that he missed the train by one minute this morning 注意 whether 可引导表语从句 但与之同义的 if 却通常不用于引导表语从句 2 简介 定义 A 表语从句就是用一个句子作为表语 说明主语是什么或者怎么 1 样 由名词 形容词或相当于名词或 形容词的词或短语充当 和连系动词一起构成谓语 The problem is puzzling 这问题令人困惑 主语 连系动词 形容词作表语 The problem is when we can get a pay rise 问题是什么时候我们可以得到加薪 主语 连系动词 一个句子作表语 表语从句 B 连接表语从句的连接词有 that what who when where which why whether how He has become a teacher 他已经成为一名教师 He has become what he wanted to be ten years ago 他已经成为了他 10 年前想成为的 She has remained there for an hour 她曾在那里停留了一个小时 She has remained where I stood yesterday for an hour 她一直在我昨天站的地方站了一个小时 His suggestion is good 他的建议是好的 His suggestion is that we should stay calm 他的建议是 我们应该保持冷静 The question is confusing 这个问题令人困惑 The question is when he can arrive at the hotel 问题是 他什么时候可以到达酒店 who will travel with me to Beijing tomorrow 谁与我明天将前往北京 why he cried yesterday 昨天他为什么哭 how I can persuade her to join us in the party 我怎么能说服她加入我们的派对 whether the enemy is marching towards us 是否敌人正向我们行进 注意 A 表语从句一定要用陈述语序 False The question is when can he arrive at the hotel Right The question is when he can arrive at the hotel B 不可以用 if 而用 whether 连接表语从句 as if 例外 引导宾语从句时可以互换 if whether 位于介词后要用 whether 位于句首时要用 whether 引导表语从句 主语从句 同位语从句时要用 whether False The question is if the enemy is marching towards us Right The question is whether the enemy is marching towards us Right It looked as if he had understood this question C 不像宾语从句 在有表语从句的复合句中 主句时态和从句时态可以不一致 Right The question is who will travel with me to Beijing tomorrow Right The question is why he cried yesterday D that 在表语从句中不可以省掉 3 基本用法 表语从句只能置于主句之后 而主句的动词只能是联系动词 名词性从句在 be 等系动词后作表语时被称为表语从句 例如 The problem is how we can get the things we need 问题是我们怎样能弄到我们需要的东西 how 在表语从句中充当方式状语 The scissors are not what I need 这把剪刀不是我所需要的 what 在表语从句中充当宾语 What I told him was that I would find him a good play 我告诉他的是我会给他找个好剧本 what 在主语从句中作直接宾语 that 作为表语从句的引导词在该表 语从句中不充当句子成分 不能省略 That is what I want to tell you 那就是我想要对你讲的 what 在表语从句 中充当直接宾语 That is why she failed to pass the exam 那就是她考试不及格的原因 why 在表语从句中充当 原因状语 注意 That is why 是常用句型 意为 这就是 的原因 因此 其中 why 引导的名词性从句在 句中作表语 该句型通常用于针对前面已经说明过的原因进行总结 又如 That is why you see this old woman before you know Jeanne 珍妮 这就是现在这个老太婆出现在你面前的原因 前文提到 Jeanne 对老妇 人显得苍老憔悴深感诧异 说话人对她讲述了其中的原因之后 用这一句来进行概括 That is why I came 这就是我来的原因 下面是两个与 That is why 形式相似的结构 它们与 That is why 结构之间的关系要能够辨析清楚 1 That is why 与 That is the reason why 同义 只不过从语法结构上讲 That is the reason why 中 why 引导的是 个定语从句 将其中的 the reason 去掉则与 That is why 结构一样 例如 That is the reason why I cannot agree 这就是我不能同意的理由 2 That is because 句型中从属连词 because 引导的名词性从句在此作表语 这也是个常用句型 意为 这就是为什么 因为 That is because 与 That is why 之间的不同在于 That is because 指 原因或理由 That is why 则指由于各种原因所造成的后果 例如 He did not see the film last night That is because he had to help his little sister with her homework 昨天晚上他没有去看电影 那是因为他得帮助他的妹 妹做作业 第一句话说明结果 第二句话说明原因 He had seen the film before That is why he did not see it last night 他以前曾看过那部电影 因此他昨天晚上没有去 看 第一句话说明原因 第二句话说明结果 五 同位语从句 1 同位语从句说明其前面的名词的具体内容 同位语从句通常由 that 引导 可用于同位语从句的名词有 advice demand doubt fact hope idea information message news order problem promise question request suggestion truth wish word 等 例如 The news that we won the game is exciting 我们赢得这场比赛的消息令人激动 I have no idea when he will come back home 我不知道他什么时候回来 The thought came to him that Mary had probably fallen ill 他想到可能玛丽生病了 同位语从句和定语从句的区别 that 作为关系代词 可以引导定语从句 充当句子成分 在从句中作宾语时可以省略 that 引导同位语从句时 起连词的作用 没有实际意义 不充当句子成分 一般不能省略 试比较下面两个例句 I had no idea that you were here that 引导同位语从句 不能省略 Have you got the idea that this book gives you of life in ancient Greece that 引导定语从句 作宾语 可以省 略 2 简介 同位语部分是个句子 就是同位语从句 这种用法比较 固定 把关键的几个词背下来 一 在复合句中用作同位语的从句叫同位语从句 它一般跟在某些名词后面 用以说明该名词表示的具体内容 如 I heard the news that our team had won 我听到了我们队获胜的消息 I had no idea that you were here 我不知道你在这里 二 可以跟同位语从句的名词通常有 news idea fact promise question doubt thought hope message suggestion words 消息 possibility 等 如 I ve come from Mr wang with a message that he won t be able to see you this afternoon 我从王先生那里来 他 让我告诉你他今天下午不能来看你了 三 英语中引导同位语从句的词通有连词 that whether 连接副词 how when where 等 注 if which 不能引 导同位语从句 如 l have no idea when he will be back 我不知道他什么时候回来 He must answer the question whether he agrees to it or not 他必须回答他是否同意这样一个问题 四 有时同位语从句可以不紧跟在说明的名词后面 而被别的词隔开 如 Several years later word came that Napoleon himself was coming to inspect them 几年以后 有消息传来说拿破仑要亲自视 察他们 The thought came to him that maybe the enemy had fled the city 他突然想起可能敌人已经逃出城了 六 名词性 that 从句 1 由从属连词 that 引导的从句叫做名词性 that 从句 That 只起连接主句和从句的作用 在从句中不担任任何 成分 本身也没有词义 名词性 that 从句在句中能充当主 语 宾语 表语 同位语和形容词宾语 例如 主语 That she is still alive is her luck 他还活着全靠运气 宾语 John said that he was leaving for London on Wednesday 约翰说他星期三要到伦敦去 表语 The fact is that he has not been seen recently 事实是近来谁也没有见过他 同位语 The fact that he has not been seen recently disturbs everyone in his office 近来谁也没有见过他 这一事实令办公室所有的人不安 形容词宾语 I am glad that you are satisfied with your job 你对工作满意我感到很高兴 2 That 从句作主语通常用 it 作先行词 而将 that 从句置于句末 例如 It is quite clear that the whole project is doomed to failure 很清楚 整个计划注定要失败 It s a pity that you should have to leave 你非走不可真是件憾事 用 it 作形式主语的 that 从句有以下四种不同的搭配关系 a It be 形容词 that 从句 It is necessary that 有必要 It is important that 重要的是 It is obvious that 很明显 b It be ed 分词 that 从句 It is believed that 人们相信 It is known to all that 众所周知 It has been decided that 已决定 c It be 名词 that 从句 It is common knowledge that 是常识 It is a surprise that 令人惊奇的是 It is a fact that 事实是 d It 不及物动词 that 从句 It appears that 似乎 It happens that 碰巧 It occurred to me that 我突然想起 七 名词性 wh 从句 1 由 wh 词引导的名词从句叫做名词性 wh 从句 Wh 词包括 who whom whose whoever what whatever which whichever 等连接代词和 where when how why 等连接副词 Wh 从句的语法功能除了和 that 从句一样外 还可充当介词宾语 宾语补语和间接宾语等 例如 主语 How the book will sell depends on its author 书销售如何取决于作者本人 直接宾语 In one s own home one can do what one likes 在自己家里可以随心所欲 间接宾语 The club will give whoever wins a prize 俱乐部将给得胜者设奖 表语 My question is who will take over president of the Foundation 我的问题是谁将接任该基金会主席职位 宾语补足语 She will name him whatever she wants to 她高兴给他起什么名字就取什么名字 同位语 I have no idea when he will return 我不知道他什么时候回来 形容词宾语 I m not sure why she refused their invitation 我尚不能肯定她为什么拒绝他们的邀请 介词宾语 That depends on where we shall go 那取决于我们去哪儿 2 Wh 从句作主语也常用先行词 it 做形式主语 而将 wh 从句置于句末 例如 It is not yet decided who will do that job 还没决定谁做这项工作 It remains unknown when they are going to get married 他们何时结婚依然不明 八 if whether 引导的名词从句 1 yes no 型疑问从句 从属连词 if whether 引导的名词从句是由一般疑问句或选择疑问转化而来的 因此也分别被称为 yes no 型疑问 句从句和选择型疑问从句 其功能和 wh 从句的功能相同 例如 主语 Whether the plan is feasible remains to be proved 这一计划是否可行还有等证实 宾语 Let us know whether if you can finish the article before Friday 请让我们知道你是否能在星期五以前把文 章写完 表语 The point is whether we should lend him the money 问题在于我们是否应该借钱给他 同位语 They are investigating the question whether the man is trustworthy 他