题文

__________ these young giant pandas grow up, they are __________ the necessary skills to live in the wild __________.

[     ]

A. When, teach, on their own B. When, taught, on themselves C. As, taught, on their own

题型：单选题  难度：中档

答案

C

据专家权威分析，试题“__________these young giant pandas grow up, they are _______..”主要考查你对  从属连词，被动语态，介词短语  等考点的理解。关于这些考点的“档案”如下：

从属连词被动语态介词短语

考点名称：从属连词

• 从属连词：
  这种连词是用以引导名词性从句定语从句和状语从句的，由从属连词所引导的句子叫从句,而含有从句的句子叫作复合句。

• 从属连词可分为三大类：
  1、that （无词义，不做成分）
  if，whether （表达是否的意义，但不做句子成分）
  2、连接代词：who，whom，whose，what，which，whatever, whoever, whichever（有词义，在句子中可作主语、表语、宾语）
  3、连接副词：when，where，why，how，how many，how long，how far，however，whenever，wherever （有词义，作从句的状语）

  用法：
  从结构上说，英语连接词分两大类：并列连词和从属连词。
  
  并列连词连接两个或两个以上地位平等的字、词组或分句。例如：
  (1) Air and water are indispensable to me. 　　
  (2) She likes going out with friends or playing outdoor games. 　　
  (3) Most workers have a good income, so they look very happy. 　　
  
  从属连词连接两个或两个以上的分句，形成复杂句中的从属分句。例如： 　　
  (4) He said that he did not want to go . 　　
  (5) Many things have happened since I last saw him. 　　
  (6) You may come if you want to. 　　
  
  从属连词用来连接各种从句。
  until(till)直到，在用until表达时间状语的句子中，主句中的动词是要十分小心去选择的。
  如动词是持续行动词，它要用肯定句，如：
  I studied hard until 12 o'clock last night.
  如果动词是瞬间截止性动词，则要用否定句，如:
  He didn't go to bed until his mother came back.
  由since,for,by,before, 来引导的时间状语从句。
  since 引导的时间状语是动作的开始时间，如:
  I have studied English since 1990.
  而by引导的时间状语通常是动作的结束时间，如：
  I had learned 25 English songs by the end of last term.

• 从属连词语法分类：
  

  种类	语法作用	连词举例
  从属连词	引导原因状语从句	Because, since
  	引导条件状语从句	If, unless, as long as
  	引导目的状语从句	So that
  	引导结果状语从句	So…that
  	引导方式状语从句	As, just as, as if
  	引导让步状语从句	Though, although, even though, no matter what, however, no matter how, whoever, no matter who, wherever, no matter where
  	引导比较状语从句	As…as, not so…as, than, less…than, the more…the more
  	引导名词性从句	Who, whom, whose, which, that, when, where, why

考点名称：被动语态

• 语态：
  是动词的一种形式，它表示主语和谓语的关系。
  语态有两种：主动语态和被动语态。
  如果主语是动作的执行者，或者是说动作是由主语完成的，要用主动语态；
  如果主语是动作的承受者，或者是说动作不是由主语而是由其他人完成的，则用被动语态。

• 被动语态的构成:
  被动语态的基本结构：
  主语+be +过去分词(+by+动作的发出者）
  ① 一般现在时：am/is/are+过去分词
  如：Trees are planted every year.
  ② 现在进行时 am/is/are+ being +过去分词
  如：The road is being repaired. 
  ③ 现在完成时 have/has + been +过去分词
  如：The work has been finished.
  ④ 一般过去时 was/were + 过去分词
  如：The story was told by him.
  Many birds were killed last year.
  ⑤过去进行时 was/were+ being + 过去分词
  如： The new house was being painted when I got home.
  ⑥过去完成时 had +been+ 过去分词
  如： He told me that the work had been finished.
  ⑦一般将来时  will +be + 过去分词
  如：The problem will be discussed tomorrow.
  ⑧ 过去将来时 would/should +be +过去分词
  如： He said that the Christmas tree would be put up soon.
  ⑨情态动词的被动语态
  情态动词+ be +过去分词    
  如：The problem must be solved soon.
  Children should be taught to love animals.

• 被动语态使用注意:
  1. 不及物动词无被动语态。 如：happen, break down, come out......
  What will happen in 100 years.
  The dinosaurs disappeared about 65 million years ago.
  2. 有些动词用主动形式表示被动意义。 如： write, sell, ride.....
  This pen writes well.
  This new book sells well.
  3. 感官动词或使役动词使用省略to的动词不定式，主动语态中不带“to”，但变为被动语态时，须加上“to”。
  例：make somebody do something→somebody+ be +made to do something
  see somebody do something→somebody +be +seen to do something
  A girl saw my wallet drop when she passed by.→My wallet was seen to drop by a girl when she passed by.
  The boss made the little boy do heavy work.→The little boy was made to do heavy work by the boss.
  4. 如果是接双宾语的动词改为被动语态时，直接宾语（物）作主语，那么动词后要用介词，这个介词是由与其搭配的动词决定。
  He gave me a book.→A book was given to me by him.
  He showed me a ticket.→A ticket was shown to me by him.
  My father bought me a new bike. →A new bike was bought for me by my father.
  5. 一些动词短语用于被动语态时，动词短语应当看作一个整体，而不能丢掉其中的介词或副词。
  We can’t laugh at him. →He can’t be laughed at by us.
  He listens to the radio every day. →The radio is listened to by him every day.
  The nurse is taking care of the sick man. →The sick man is being taken care of by the nurse.
  构成be+done.

• 主动句变为被动句所遵循的4个步骤：
  ①把原主动句中的宾语变为被动句的主语
  ②把动词变为被动形式即be +过去分词，并注意其人称和数随主语的变化，而动词的时态则保持不变。
  ③原主动句的主语如需要则放在by后面以它的宾格形式出现（注代词的宾格），如不需要则可省略。
  ④其它的成分（定语、状语）不变。
  
  不用于被动语态的情形：