—Could you tell me _______ the bikes this morning? —He did it with the help of his father. [ ]A. how did he fix up B. how he fixes up C. how he fixed up -九年级英语

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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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