If和Whether如何使用

3327 2006-06-21
if和whether 除了引导宾语从句和状语从句外,还在其他句子出现吗?

  引导宾语从句和状语从句该如何使用啊?
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whether与if作“是否”讲,在用法上有相同之处,也有不同之处。 
  一、相同之处。 
  1.whether和if都能引导宾语从句,常置于see,ask,learn,tell,wonder,doubt,find out等动词之后。 
  如:He asked me whether/is I could help him. I want to know whether/if he lives there. 
  2.whether和if都可用it作形式主语从句中。如: it's uncertain whether/if he'll come this evening. 
  3.在be uncertain/doubtful之后,常用whether引导宾语从句,有时也可以用if,如: We are uncertain whether/if Mary will come. 
  二、不同之处。 
  1.whether可置于句首引导主语从句,而if不能。如: ___the 2000 Olympic Games will be in Beijing is not know
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whether与if作“是否”讲,在用法上有相同之处,也有不同之处。 
  一、相同之处。 
  1.whether和if都能引导宾语从句,常置于see,ask,learn,tell,wonder,doubt,find out等动词之后。 
  如:He asked me whether/is I could help him. I want to know whether/if he lives there. 
  2.whether和if都可用it作形式主语从句中。如: it's uncertain whether/if he'll come this evening. 
  3.在be uncertain/doubtful之后,常用whether引导宾语从句,有时也可以用if,如: We are uncertain whether/if Mary will come. 
  二、不同之处。 
  1.whether可置于句首引导主语从句,而if不能。如: ___the 2000 Olympic Games will be in Beijing is not known yet. A.whether B.If C.Whether D.That 答案是C。 
  2.whether可用在介词之后,引导宾语从句,而If则不能。如: Success depends on whether we make evough effort. 
  3.whether可引导表语从句,if则不能。如: The puestion is whether it is not worthdoing. 
  4.在名词之后引导同位语从句时,用whether而不用if。如: The puestion whether the students answered correctly should be decided by the teacher. 
  5.whether后可接不定式,而if不能。如: Please tell us whether to go or stay here. 
  6.在有些动词(如discuss)之后,只能用whether,而不用if引导宾语从句。如: We discussed whether we should close the shop. 
  7.在引导否定概念in宾语从句时,只能用if,而不用whether.如:he asked me if I hadn't finished my work. 
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2006-06-22
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  • jenny

    if和whether都可译为\"是否\",二者引导宾语从句时通常可以互相替换,口语中多用if代替whether。例如:Askif/whetherheplanstocometothemeeting.而以下几种情况中,只能用 强调两方面的选择,特别是句中有ornot时。如:Letmeknowwhetheryoucancomeornot.2.宾语从句前置时。如:Whetherthisistrue,Ican\'tsay.3.引导主语、表语、同位语从句时。如:Whetherthefootballgamewillbeplayeddependsontheweather.(主语从句)Thequestioniswhetherhecandoit.(表语从句)Thequestionwhetherweshouldgowiththemmustbedecidedatonce.(同位语从句)4.在介词之后作介词的宾语时。如:Ihaven\'tsettledthequestionofwhetherI\'llgobackhome.5.在不定式前与不定式一起组成词组时。如:Whethertogoorstayisstill
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    if和whether都可译为\"是否\",二者引导宾语从句时通常可以互相替换,口语中多用if代替whether。例如:Askif/whetherheplanstocometothemeeting.而以下几种情况中,只能用 强调两方面的选择,特别是句中有ornot时。如:Letmeknowwhetheryoucancomeornot.2.宾语从句前置时。如:Whetherthisistrue,Ican\'tsay.3.引导主语、表语、同位语从句时。如:Whetherthefootballgamewillbeplayeddependsontheweather.(主语从句)Thequestioniswhetherhecandoit.(表语从句)Thequestionwhetherweshouldgowiththemmustbedecidedatonce.(同位语从句)4.在介词之后作介词的宾语时。如:Ihaven\'tsettledthequestionofwhetherI\'llgobackhome.5.在不定式前与不定式一起组成词组时。如:Whethertogoorstayisstillaquestion.6.在discuss,decide等动词后作宾语时。如:Wediscussedwhetherweshouldgotherebyplane.值得注意的是:if还可以引导条件状语从句,是\"假如;如果\"之意,而whether可以引导让步状语从句,是\"不管;无论\"之意。如:Ifyouaskhim,hewillhelpyou.Ishallgo,whetheryoucomewithmeorstayathome.
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    2006-06-22

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  • 栗宁1991

    1. if可以引导条件状语从句,表示“如果”,whether不可以这么用
    2. if和whether都有“是否”的意思,有whether句中有“or not”。
    3,引导主语从句时,用if不用whether 
    
    										

    2006-06-22

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  • zhongnanhengsz

    1、if可以引导条件状语从句,表示“如果”,whether不可以这么用
    2、if和whether谈得上区别的时候就是引导宾语从句的时候,两者都有“是否”的意思,用法有所区别,从句中有“or not”出现时,必须用whether
    3,引导主语从句时,用if不用whether
    										

    2006-06-22

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  • 1216909641

    if和whether
    										

    2006-06-22

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  • 飞梭

    In informal writing both if  and  whether  are standard in their use to introduce a clause indicating uncertainty after a verb such as  ask, doubt, know, learn,  or  see:  
    在非正式的写作中,可以使用if 或 wether 两个词来表达不定性,两者都算标准,例如 ask,doubt,know,learn, 或 see这样的动词后: 
    We shall soon learn whether (or  if )  it is true.  
    我们很快就会知道这是否(或 if ) 是真实的。  
    In such contexts, however, the use of if  can sometimes create ambiguities.  Depending on the intended meaning, the sentence Let her know if she is invited   migh
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    In informal writing both if  and  whether  are standard in their use to introduce a clause indicating uncertainty after a verb such as  ask, doubt, know, learn,  or  see:  
    在非正式的写作中,可以使用if 或 wether 两个词来表达不定性,两者都算标准,例如 ask,doubt,know,learn, 或 see这样的动词后: 
    We shall soon learn whether (or  if )  it is true.  
    我们很快就会知道这是否(或 if ) 是真实的。  
    In such contexts, however, the use of if  can sometimes create ambiguities.  Depending on the intended meaning, the sentence Let her know if she is invited   might be better paraphrased as Let her know whether she is invited or If she is invited, let her know.  ·  In conditional sentences the clause introduced by if   may contain either a past subjunctive verb (if I were going ) or an indicative verb ( if I am going; if I was going ),  depending on the intended meaning. According to the traditional rule, the subjunctive should be used to describe an occurrence that is presupposed to be contrary to fact, as in if I were ten years younger or  if Napoleon had won at Waterloo.  The main verb of such a sentence must then contain the modal verb would  or (less frequently)  should:  
    不过在这种情况下,用if 就可能会造成歧义。 Let her know if she is invited  这句话最好根据所要表达的意思, 分开说成告诉她她是否被邀请了 或 如果她被邀请了,就让她知道 两句话。 用if 引起的条件状语从句中, 可以含有一个过去式的虚拟动词(倘若我去 )或一个一般陈述动词( 如果我就去;如果我去了 ), 这得依据所要表达的意思而定。根据正统的原则,虚拟语气用来表达一个与事实相反的假设,例如如果我再年轻十岁 或者 如果拿破仑在滑铁卢战役中获胜。  于是在这样的句子里,主要动词必须包含情态动词会 或(在较少情况下) 应该: 
    If America were still a British colony, 
    如果美国现在还是英国的殖民地,
    we would have an anthem that human voices could sing. 
    我们就会有一支人人都会唱的国歌。
    If I were the President, 
    如果我是总统,
    I should (or  would )  declare November 1 a national holiday.  When the situation described by the if  clause is not presupposed to be false, however,  that clause must contain an indicative verb, and the choice of verb in the main clause will depend on the intended meaning: 
    我就(或 会 ) 宣布十一月一日为国家休假日。  而只要if 引起的从句描述的条件不是事先就被认为是不可能的, 从句中就必须使用直陈动词,而主句中词的形式就要依所要表达的意义而定:
    If Hamlet was really written by Marlowe, as many have argued, then we have underestimated Marlowe's genius. 
    如果就象很多人猜测的那样,《哈姆雷特》一剧是由马洛写的,那我们就一直低估了马洛的才能。
    If Kevin was out all day, then it makes sense that he couldn't answer the phone. 
    如果确实一直在外面,打电话找不着他是很正常的。 
    Note also that the presence of the modal verb would  in the main clause should not be taken as a sign that the verb in the  if  clause must be in the subjunctive, if the content of that clause is not presupposed to be false:  
    另须注意,在主句中使用情态动词would 并不表明 if 从句中一定使用虚拟语气,因为从句的内容并不一定原先就认为是错误的: 
    If I was (not  were )  to accept their offer—which I'm still considering—I would have to start the new job on May 2.  
    如果我去(不是 were ) 接受他们的盛情——我还在这样考虑——那么我必须在5月2日开始新工作。 
    He would always call her from the office if he was (not  were )  going to be late for dinner.  ·  
    如果他(不是 were ) 晚餐会迟到,就会从办公室打电话给她。  ·  
    Again according to the traditional rule, the subjunctive is not correctly used  following verbs such as ask  or  wonder  in  if  clauses that express indirect questions,  even if the content of the question is presumed to be contrary to fact: 
    另外还是根据传统规则,在动词ask 或  wonder 中 if 引导的间接问句, 即使其内容被认为与事实相反,也不能使用虚拟语气:
    We wondered if dinner was (not  were )  included in the room price.  
    我们想知道晚餐费用是否被(不是 were ) 包括在房间费中。 
    Some of the people we met even asked us if California was (not  were )  an island.  ·  
    我们碰到的一些人甚至问我们加利福尼亚是否是(不用 were ) 一个岛屿。   
    With all deference to the traditional rules governing the use of the subjunctive, it should be noted that a survey of the prose of reputable writers over the past 200 years would reveal a persistent tendency to use the indicative was  where the traditional rule would require the subjunctive  were.   A sentence beginning If I was the only boy in the world,  while not strictly correct, is wholly unremarkable.  But the corresponding practice of using the subjunctive in place of the indicative may be labeled a hypercorrection. · In spoken English there is a growing tendency to use would have  in place of the subjunctive in contrary-to-fact clauses,  as in if I would have been the President,  but this usage is still widely considered incorrect.See Usage Note at doubt, should, wish 
    在与指导虚拟语气使用方法的传统规则相冲突的一系列不同用法中,我们应注意到一项对过去200年散文作家的调查显示,在传统语法要求使用虚拟式的were 的情况下,有一种持久的使用直陈式 was 的趋势。 一句用假如我是世界上唯一的男孩 开头的句子不会引起人们的注意。 而一定要把其中的直陈式换成虚拟式就显得矫正过了头。在英语口语中,在与事实相反的从句中,使用would have 一词的趋势有所增加, 例如如果我会是总统,  但这种用法仍然被大多数人认为是不正确的参见 doubt, should, wish
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  • 不是露露

       你查过《高考必备》吗?希望它能帮助你。祝你好运!
    										

    2006-06-21

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