-----could you tell me( )----yes,he( )to the U.S.AA.has been B. has gone C.has been D.has gone我选D.could在这里不能看成是can的过去式吗?_百度作业帮
-----could you tell me( )----yes,he( )to the U.S.AA.has been B. has gone C.has been D.has gone我选D.could在这里不能看成是can的过去式吗?
这里的could只是表一种委婉的语气,并不是指can的过去式,情态动词都有些类似的特性,例如will和would,在不同情况下,would有时是will的过去式,而有时则表示为一种较委婉的语气例如：（could可以看作是can的过去式,这两个词除了时态不相同外,在表达意思的许多方面是相同的.当然could也有自己独特的用法.）1）表示脑力或体力上的能力Nobody can stop the development of science .谁也无法阻止科学的发展.She can sing that song in English.她能用英文唱那歌.He can submerge to a depth of about twenty meters .他能潜入约二十米深的水中.He could hardly support his family before he found the new job .他在找到那份新工作前几乎无 法养家.I could not understand the lecture on the computer given by Mr. Smith .我听不懂史密斯先生作的那个关于计算机的讲座.2)表示客观上的可能性You can borrow this useful book from the library .你可以从图书馆借到这种有用的书.A more suitable person than him for the job can not be found . 不可能找到比他更适合这份工作的人了.Now people can skate on the lake .现在人们可以在湖上滑冰了.When the storm stopped , the plane could take off .当风暴停下来时,飞机可以起飞了不得.3)表示主观上的允许Can I ask you some questions about it ?我可以问你有关这件事的几个问题吗?You can not leave here till I come back .直到我回来你才能离开.Such kind of thing can't happen any more later .这类事以后不准再发生了.Can you tell me how to get to the airport ? 你能告诉我怎么去机场吗?Could you tell me how to get to the airport ?您能告诉我怎么去机场吗?Could I be forgiven my negligence ? 请原谅我的疏忽,行吗?4）（用于否定句、疑问句或感叹句中）表示猜测、怀疑或惊诧How can / could you be here ? 你怎么会在这儿?She couldn't / can't be so stupid to do that .她不可能蠢得去做那种事吧.He couldn't / can't be over seventy .他不可能有七十多岁了.Where could / can the boy be now ? 那孩子现在能在哪儿呢?另外,could还常用于表示较客气委婉的看法、提问及用于虚拟语气的结构中.这时候,could就不可以看作是can的过去式了.而是could自己独特的用法.如：Could you speak a little slowly ?您能稍微说慢一点儿吗?I'm afraid that we couldn't give you any definite answer at this moment .恐怕我们这时候还无法给予您任何确切的答复.I could come earlier if asked .如果要让我早一点来,我可以来早一点.We would appreciate it if you could offer us any help .如果您能为我们提供帮助的话,我们将不甚感激.You could have done better if you had worked harder at it .如果你再加把劲,本来可以干得更好一些的.
Could这里只是一种委婉的说法，跟时态没什么关系当前位置：
＞＞＞Could you tell me _____?[ ]A．when will the meeting startB．w..
Could you tell me _____?
A．when will the meeting start&&&&B．when the meeting will startC．the meeting will start when D．the meeting when will start
题型：单选题难度：中档来源：山东省期中题
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据魔方格专家权威分析，试题“Could you tell me _____?[ ]A．when will the meeting startB．w..”主要考查你对&&宾语从句&&等考点的理解。关于这些考点的“档案”如下：
现在没空？点击收藏，以后再看。
因为篇幅有限，只列出部分考点，详细请访问。
宾语从句：在句子中起宾语作用的从句叫做宾语从句。宾语从句分为三类：动词的宾语从句，介词的宾语从句和形容词的宾语从句。宾语从句连接代词主要有：who, whom ,whose ,what ,whoever ,whomever ,whosever, whatever, whichever 等。 宾语从句的特点:1.宾语从句可以作及物动词、介词及形容词的宾语。2.宾语从句的语序一律用陈述句语序。3.连接词that引导宾语从句在句中无词义，不充当句子成份，多数情况下可以省略。4.whether 和 if 都可引导宾语从句，但 whether后可紧跟or not；whether从句可作介词的宾语。5.如果从句太长，可以用形式宾语it.
宾语从句的时态:1.主句是一般现在时，从句根据实际情况使用任何时态。例句：The headmaster hopes everything goes well.2.主句是过去时态，从句须用过去时态的某种形式。例句：She was sorry that she hadn’t finished her work on time.3.当宾语从句表示的是一个客观真理或者事实时，即使主句是过去时，从句也用一般现在时态。例句：The teacher told his class that light travels faster than sound.4.&如果从句的动作发生在主句之前，则从句要用过去完成时态。&宾语从句的语序:A. 宾语从句必须用陈述语序。 　　 False: He is wondering when can he finish this difficult job. 　　 Right: He is wondering when he can finish this difficult job. B. 有时候可以用it 作形式宾语，而把真正的宾语从句放在后面。 　　　 Bad: I thought that he could finish this　job in just two hours impossible. 　　 Good: I thought it impossible that he could finish this job in just two&hours.　&C. 带有宾语从句的复合句的否定形式一般是否定主句。 Bad: I think he doesn’t like the English teacher. 　　 Good: I don’t think he likes the English teacher.&D.&&主句一般过去时态，从句也要用过去时态。 False: He wanted to know why he is crying in the corner. 　　 Right: He wanted to know why he was crying in the corner
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? 宾语从句中引导词的用法比较在复合句中作主句的宾语，引导词有：连词：that (that 常可省略),whether, if代词：who, whose, what ,which副词：when ,where, how, why 等。（一）that引导的宾语从句（在非正式场合that可以省略）1.可跟that从句做宾语的动词有：say, think, insist, wish, hope, demand, imagine, wonder, know, suppose, see, believe, agree, admit, deny, expect, explain, order, command, feel, dream, suggest, hear, mean, notice, prefer, request, require, propose, declare, report等。例句：The boy believes that he will travel through space to other planets.注意事项：当主句谓语动词是 think, believe, suppose, expect 等词，而宾语从句的意思是否定时，常把否定转移至主句表示。例句：I don’t think it is right for him to treat you like that.2.在以下情况中that不能省略a.当句中的动词后接多于两个由that引导的宾语从句时，第一个that可省，但后面的that不可省。例句：He said (that) you were too young to understand the matter and that he was asked not to tell you.b.当主句的谓语动词与that宾语从句之间有插入语时，that一般不可省。例句：Just then I noticed, for the first time, that our master was wearing his fine green coat and his black silk cap.c.当that从句是双宾语中的直接宾语时，that不可省。例句：I can’t tell him that his mother died.d.注:许多带复合宾语的句子，that引导的宾语从句经常移到句子后部，而用it作形式宾语。例句：I find it necessary that we should do the homework on time.（二）由whether,if 引导的宾语从句1.由whether(if)引导的宾语从句，实际上是一般疑问句演变而来的。意思是“是否”。宾语从句要用陈述句语序。一般说来，在宾语从句中whether与if可以互换使用，但在特殊情况下if与whether是不能互换的。例句：I wonder whether(if) they will come to our party.2.只能用whether，不能用if引导的宾语从句a.在带to的不定式前例句：We decided whether to walk there.b.在介词的后面例句：I’m thinking of whether we should go to see the film.c.在动词后面的宾语从句时例句：We discussed whether we had a sports meeting next weekd.直接与or not连用时例句：I can’t say whether or not thet can come on time.3.只能用if不能用whether引导的宾语从句a.if引导条件状语从句，意为“如果”例句：The students will go on a picnic if it is sunny.b.if引导否定概念的宾语从句时例句：He asked if I didn’t come to school yesterday.c.引导状语从句even if（即使）和as if（好象）时例句：He talks as if he has known all about it.
if,whether在宾语从句中的区别 a.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 b.少数动词,如:leave,put,discuss,doubt后的宾语从句常用whether.&c. whether后可以加or not,但是if不可以. d.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。） e.避免歧异时,我们常用whether而不用if.（三）连接代词和连接副词引导的宾语从句这样的宾语从句实际上是由特殊疑问句变化而来的，宾语从句要用陈述句语序。用于这种结构的动词常常是：see, say, tell, ask, answer, know, decide, show, find out, imagine, suggest, doubt, wonder, discover, understand, inform, advise等。1.英语中的连接代词有：who,whom,whose,which,what,在句中担任主语、宾语、定语或者表语。例句：Can you tell me whom you are waiting for?2.英语中的连接副词有：when,where,why,how，在句中担任状语的成分。例句：None of us knows where these new parts can be bought.简化宾语从句常用六法：方法一：当主句谓语动词是hope， decide， wish， choose， agree， promise等，且宾语从句的主语与主句主语一致时，宾语从句可简化为不定式结构。例如：Li Ming hopes he will be back very soon.→Li Ming hopes to be back very soon.We decided that we would help him. →We decided to help him.方法二：当主句谓语动词是know， learn， remember， forget， tell等动词，且主句主语与从句主语一致时，宾语从句可简化为“疑问词+不定式”结构。例如：She has forgotten how she can open the window.→She has forgotten how to open the window.注：当主句谓语动词是tell， ask， show， teach等动词，且后带双宾语，从句主语和间接宾语一致时，宾语从句可简化为“疑问词+不定式”结构。例如：Could you tell me how I can get to the station？ →Could you tell me how to get to the station？方法三：当主句的谓语动词是order（命令），require（需要）等时，如果主句和从句的主语不一致，宾语从句可简化为“名词（代词）+不定式”结构。例如：The headmaster ordered that we should start at once. → The headmaster ordered us to start at once.方法四：某些动词后的宾语从句，可以用介词加动名词（短语）等其他形式简化。例如：He insisted that he should go with us.→He insisted on going with us.The poor boy doesn’t know when and where he was born.→The poor boy doesn’t know the time and the place of his birth.方法五：某些动词后面的宾语从句可转化为“宾语+V-ing形式（作宾语补足语）”结构。例如：Liu Ping found that there was a wallet lying on the ground.→ Liu Ping found a wallet lying on the ground.方法六：动词seem后的宾语从句，也可以用不定式（短语）来简化，但句型需要进行适当的变化。例如：It seemed that the boys were going to win. →The boys seemed to win.除上述方法外，还有一些特殊句式的转化。例如：I found that it was difficult to learn English well. →I found it difficult to learn English well.Soon we found that the ground was covered with thick snow. →Soon we found the ground covered with thick snow.They found that the box was very heavy. →They found the box very heavy&
发现相似题
与“Could you tell me _____?[ ]A．when will the meeting startB．w..”考查相似的试题有：
28507975881294377123496314183122934当前位置：
＞＞＞ —Excuse me, could you tell me __________?—In ten minutes...
—Excuse me, could you tell me __________?—In ten minutes.A．how long the train will leaveB．how soon the plane will arriveC．when did the train leaveD．when the train left
题型：单选题难度：中档来源：不详
B试题分析：宾语从句要用陈述语序，根据答语in ten minutes十分钟之后，in+一段时间常与将来时连用。how soon多久之后，从句在句中作tell的宾语。 句意：你能告诉我飞机什么时候到达吗？十分钟之后。故选B。
马上分享给同学
据魔方格专家权威分析，试题“ —Excuse me, could you tell me __________?—In ten minutes...”主要考查你对&&宾语从句&&等考点的理解。关于这些考点的“档案”如下：
现在没空？点击收藏，以后再看。
因为篇幅有限，只列出部分考点，详细请访问。
宾语从句：在句子中起宾语作用的从句叫做宾语从句。宾语从句分为三类：动词的宾语从句，介词的宾语从句和形容词的宾语从句。宾语从句连接代词主要有：who, whom ,whose ,what ,whoever ,whomever ,whosever, whatever, whichever 等。 宾语从句的特点:1.宾语从句可以作及物动词、介词及形容词的宾语。2.宾语从句的语序一律用陈述句语序。3.连接词that引导宾语从句在句中无词义，不充当句子成份，多数情况下可以省略。4.whether 和 if 都可引导宾语从句，但 whether后可紧跟or not；whether从句可作介词的宾语。5.如果从句太长，可以用形式宾语it.
宾语从句的时态:1.主句是一般现在时，从句根据实际情况使用任何时态。例句：The headmaster hopes everything goes well.2.主句是过去时态，从句须用过去时态的某种形式。例句：She was sorry that she hadn’t finished her work on time.3.当宾语从句表示的是一个客观真理或者事实时，即使主句是过去时，从句也用一般现在时态。例句：The teacher told his class that light travels faster than sound.4.&如果从句的动作发生在主句之前，则从句要用过去完成时态。&宾语从句的语序:A. 宾语从句必须用陈述语序。 　　 False: He is wondering when can he finish this difficult job. 　　 Right: He is wondering when he can finish this difficult job. B. 有时候可以用it 作形式宾语，而把真正的宾语从句放在后面。 　　　 Bad: I thought that he could finish this　job in just two hours impossible. 　　 Good: I thought it impossible that he could finish this job in just two&hours.　&C. 带有宾语从句的复合句的否定形式一般是否定主句。 Bad: I think he doesn’t like the English teacher. 　　 Good: I don’t think he likes the English teacher.&D.&&主句一般过去时态，从句也要用过去时态。 False: He wanted to know why he is crying in the corner. 　　 Right: He wanted to know why he was crying in the corner
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? 宾语从句中引导词的用法比较在复合句中作主句的宾语，引导词有：连词：that (that 常可省略),whether, if代词：who, whose, what ,which副词：when ,where, how, why 等。（一）that引导的宾语从句（在非正式场合that可以省略）1.可跟that从句做宾语的动词有：say, think, insist, wish, hope, demand, imagine, wonder, know, suppose, see, believe, agree, admit, deny, expect, explain, order, command, feel, dream, suggest, hear, mean, notice, prefer, request, require, propose, declare, report等。例句：The boy believes that he will travel through space to other planets.注意事项：当主句谓语动词是 think, believe, suppose, expect 等词，而宾语从句的意思是否定时，常把否定转移至主句表示。例句：I don’t think it is right for him to treat you like that.2.在以下情况中that不能省略a.当句中的动词后接多于两个由that引导的宾语从句时，第一个that可省，但后面的that不可省。例句：He said (that) you were too young to understand the matter and that he was asked not to tell you.b.当主句的谓语动词与that宾语从句之间有插入语时，that一般不可省。例句：Just then I noticed, for the first time, that our master was wearing his fine green coat and his black silk cap.c.当that从句是双宾语中的直接宾语时，that不可省。例句：I can’t tell him that his mother died.d.注:许多带复合宾语的句子，that引导的宾语从句经常移到句子后部，而用it作形式宾语。例句：I find it necessary that we should do the homework on time.（二）由whether,if 引导的宾语从句1.由whether(if)引导的宾语从句，实际上是一般疑问句演变而来的。意思是“是否”。宾语从句要用陈述句语序。一般说来，在宾语从句中whether与if可以互换使用，但在特殊情况下if与whether是不能互换的。例句：I wonder whether(if) they will come to our party.2.只能用whether，不能用if引导的宾语从句a.在带to的不定式前例句：We decided whether to walk there.b.在介词的后面例句：I’m thinking of whether we should go to see the film.c.在动词后面的宾语从句时例句：We discussed whether we had a sports meeting next weekd.直接与or not连用时例句：I can’t say whether or not thet can come on time.3.只能用if不能用whether引导的宾语从句a.if引导条件状语从句，意为“如果”例句：The students will go on a picnic if it is sunny.b.if引导否定概念的宾语从句时例句：He asked if I didn’t come to school yesterday.c.引导状语从句even if（即使）和as if（好象）时例句：He talks as if he has known all about it.
if,whether在宾语从句中的区别 a.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 b.少数动词,如:leave,put,discuss,doubt后的宾语从句常用whether.&c. whether后可以加or not,但是if不可以. d.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。） e.避免歧异时,我们常用whether而不用if.（三）连接代词和连接副词引导的宾语从句这样的宾语从句实际上是由特殊疑问句变化而来的，宾语从句要用陈述句语序。用于这种结构的动词常常是：see, say, tell, ask, answer, know, decide, show, find out, imagine, suggest, doubt, wonder, discover, understand, inform, advise等。1.英语中的连接代词有：who,whom,whose,which,what,在句中担任主语、宾语、定语或者表语。例句：Can you tell me whom you are waiting for?2.英语中的连接副词有：when,where,why,how，在句中担任状语的成分。例句：None of us knows where these new parts can be bought.简化宾语从句常用六法：方法一：当主句谓语动词是hope， decide， wish， choose， agree， promise等，且宾语从句的主语与主句主语一致时，宾语从句可简化为不定式结构。例如：Li Ming hopes he will be back very soon.→Li Ming hopes to be back very soon.We decided that we would help him. →We decided to help him.方法二：当主句谓语动词是know， learn， remember， forget， tell等动词，且主句主语与从句主语一致时，宾语从句可简化为“疑问词+不定式”结构。例如：She has forgotten how she can open the window.→She has forgotten how to open the window.注：当主句谓语动词是tell， ask， show， teach等动词，且后带双宾语，从句主语和间接宾语一致时，宾语从句可简化为“疑问词+不定式”结构。例如：Could you tell me how I can get to the station？ →Could you tell me how to get to the station？方法三：当主句的谓语动词是order（命令），require（需要）等时，如果主句和从句的主语不一致，宾语从句可简化为“名词（代词）+不定式”结构。例如：The headmaster ordered that we should start at once. → The headmaster ordered us to start at once.方法四：某些动词后的宾语从句，可以用介词加动名词（短语）等其他形式简化。例如：He insisted that he should go with us.→He insisted on going with us.The poor boy doesn’t know when and where he was born.→The poor boy doesn’t know the time and the place of his birth.方法五：某些动词后面的宾语从句可转化为“宾语+V-ing形式（作宾语补足语）”结构。例如：Liu Ping found that there was a wallet lying on the ground.→ Liu Ping found a wallet lying on the ground.方法六：动词seem后的宾语从句，也可以用不定式（短语）来简化，但句型需要进行适当的变化。例如：It seemed that the boys were going to win. →The boys seemed to win.除上述方法外，还有一些特殊句式的转化。例如：I found that it was difficult to learn English well. →I found it difficult to learn English well.Soon we found that the ground was covered with thick snow. →Soon we found the ground covered with thick snow.They found that the box was very heavy. →They found the box very heavy&
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＞＞＞—Could you tell me________. ?—Quite well, thank you.A．wha..
—Could you tell me________. ?—Quite well, thank you.A．what do you doB．are you good at mathC．what you think of the filmD．howyou are getting on with classmates
题型：单选题难度：偏易来源：不详
D试题分析：英语宾语从句中一般为陈述语序。选项AB为倒装语序，选项C意思是你认为这部电影怎么样，结合语境可知本句应用一般过去时态。选项D表示你现在和同学们相处的怎么样。根据下文，相当不错，谢谢你。可知选D最符合语境。
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据魔方格专家权威分析，试题“—Could you tell me________. ?—Quite well, thank you.A．wha..”主要考查你对&&宾语从句&&等考点的理解。关于这些考点的“档案”如下：
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宾语从句：在句子中起宾语作用的从句叫做宾语从句。宾语从句分为三类：动词的宾语从句，介词的宾语从句和形容词的宾语从句。宾语从句连接代词主要有：who, whom ,whose ,what ,whoever ,whomever ,whosever, whatever, whichever 等。 宾语从句的特点:1.宾语从句可以作及物动词、介词及形容词的宾语。2.宾语从句的语序一律用陈述句语序。3.连接词that引导宾语从句在句中无词义，不充当句子成份，多数情况下可以省略。4.whether 和 if 都可引导宾语从句，但 whether后可紧跟or not；whether从句可作介词的宾语。5.如果从句太长，可以用形式宾语it.
宾语从句的时态:1.主句是一般现在时，从句根据实际情况使用任何时态。例句：The headmaster hopes everything goes well.2.主句是过去时态，从句须用过去时态的某种形式。例句：She was sorry that she hadn’t finished her work on time.3.当宾语从句表示的是一个客观真理或者事实时，即使主句是过去时，从句也用一般现在时态。例句：The teacher told his class that light travels faster than sound.4.&如果从句的动作发生在主句之前，则从句要用过去完成时态。&宾语从句的语序:A. 宾语从句必须用陈述语序。 　　 False: He is wondering when can he finish this difficult job. 　　 Right: He is wondering when he can finish this difficult job. B. 有时候可以用it 作形式宾语，而把真正的宾语从句放在后面。 　　　 Bad: I thought that he could finish this　job in just two hours impossible. 　　 Good: I thought it impossible that he could finish this job in just two&hours.　&C. 带有宾语从句的复合句的否定形式一般是否定主句。 Bad: I think he doesn’t like the English teacher. 　　 Good: I don’t think he likes the English teacher.&D.&&主句一般过去时态，从句也要用过去时态。 False: He wanted to know why he is crying in the corner. 　　 Right: He wanted to know why he was crying in the corner
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? 宾语从句中引导词的用法比较在复合句中作主句的宾语，引导词有：连词：that (that 常可省略),whether, if代词：who, whose, what ,which副词：when ,where, how, why 等。（一）that引导的宾语从句（在非正式场合that可以省略）1.可跟that从句做宾语的动词有：say, think, insist, wish, hope, demand, imagine, wonder, know, suppose, see, believe, agree, admit, deny, expect, explain, order, command, feel, dream, suggest, hear, mean, notice, prefer, request, require, propose, declare, report等。例句：The boy believes that he will travel through space to other planets.注意事项：当主句谓语动词是 think, believe, suppose, expect 等词，而宾语从句的意思是否定时，常把否定转移至主句表示。例句：I don’t think it is right for him to treat you like that.2.在以下情况中that不能省略a.当句中的动词后接多于两个由that引导的宾语从句时，第一个that可省，但后面的that不可省。例句：He said (that) you were too young to understand the matter and that he was asked not to tell you.b.当主句的谓语动词与that宾语从句之间有插入语时，that一般不可省。例句：Just then I noticed, for the first time, that our master was wearing his fine green coat and his black silk cap.c.当that从句是双宾语中的直接宾语时，that不可省。例句：I can’t tell him that his mother died.d.注:许多带复合宾语的句子，that引导的宾语从句经常移到句子后部，而用it作形式宾语。例句：I find it necessary that we should do the homework on time.（二）由whether,if 引导的宾语从句1.由whether(if)引导的宾语从句，实际上是一般疑问句演变而来的。意思是“是否”。宾语从句要用陈述句语序。一般说来，在宾语从句中whether与if可以互换使用，但在特殊情况下if与whether是不能互换的。例句：I wonder whether(if) they will come to our party.2.只能用whether，不能用if引导的宾语从句a.在带to的不定式前例句：We decided whether to walk there.b.在介词的后面例句：I’m thinking of whether we should go to see the film.c.在动词后面的宾语从句时例句：We discussed whether we had a sports meeting next weekd.直接与or not连用时例句：I can’t say whether or not thet can come on time.3.只能用if不能用whether引导的宾语从句a.if引导条件状语从句，意为“如果”例句：The students will go on a picnic if it is sunny.b.if引导否定概念的宾语从句时例句：He asked if I didn’t come to school yesterday.c.引导状语从句even if（即使）和as if（好象）时例句：He talks as if he has known all about it.
if,whether在宾语从句中的区别 a.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 b.少数动词,如:leave,put,discuss,doubt后的宾语从句常用whether.&c. whether后可以加or not,但是if不可以. d.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。） e.避免歧异时,我们常用whether而不用if.（三）连接代词和连接副词引导的宾语从句这样的宾语从句实际上是由特殊疑问句变化而来的，宾语从句要用陈述句语序。用于这种结构的动词常常是：see, say, tell, ask, answer, know, decide, show, find out, imagine, suggest, doubt, wonder, discover, understand, inform, advise等。1.英语中的连接代词有：who,whom,whose,which,what,在句中担任主语、宾语、定语或者表语。例句：Can you tell me whom you are waiting for?2.英语中的连接副词有：when,where,why,how，在句中担任状语的成分。例句：None of us knows where these new parts can be bought.简化宾语从句常用六法：方法一：当主句谓语动词是hope， decide， wish， choose， agree， promise等，且宾语从句的主语与主句主语一致时，宾语从句可简化为不定式结构。例如：Li Ming hopes he will be back very soon.→Li Ming hopes to be back very soon.We decided that we would help him. →We decided to help him.方法二：当主句谓语动词是know， learn， remember， forget， tell等动词，且主句主语与从句主语一致时，宾语从句可简化为“疑问词+不定式”结构。例如：She has forgotten how she can open the window.→She has forgotten how to open the window.注：当主句谓语动词是tell， ask， show， teach等动词，且后带双宾语，从句主语和间接宾语一致时，宾语从句可简化为“疑问词+不定式”结构。例如：Could you tell me how I can get to the station？ →Could you tell me how to get to the station？方法三：当主句的谓语动词是order（命令），require（需要）等时，如果主句和从句的主语不一致，宾语从句可简化为“名词（代词）+不定式”结构。例如：The headmaster ordered that we should start at once. → The headmaster ordered us to start at once.方法四：某些动词后的宾语从句，可以用介词加动名词（短语）等其他形式简化。例如：He insisted that he should go with us.→He insisted on going with us.The poor boy doesn’t know when and where he was born.→The poor boy doesn’t know the time and the place of his birth.方法五：某些动词后面的宾语从句可转化为“宾语+V-ing形式（作宾语补足语）”结构。例如：Liu Ping found that there was a wallet lying on the ground.→ Liu Ping found a wallet lying on the ground.方法六：动词seem后的宾语从句，也可以用不定式（短语）来简化，但句型需要进行适当的变化。例如：It seemed that the boys were going to win. →The boys seemed to win.除上述方法外，还有一些特殊句式的转化。例如：I found that it was difficult to learn English well. →I found it difficult to learn English well.Soon we found that the ground was covered with thick snow. →Soon we found the ground covered with thick snow.They found that the box was very heavy. →They found the box very heavy&
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