新概念2册L21笔记（情态动词的被动语态）

L21 Mad or not

本课单词和备注
  mad adj. 
    形容通常出现在主系表中，He is mad
    go mad 疯的  
      I'll go mad if i have to wait much longer #如果我再等下去，我会疯掉的
    be mad at/with sb 气愤
      She' mad at me for being late  #她为我迟到而生气
    be mad  疯迷的  
      be mad about sb/sth
        He's mad about sports
        He's mad about you
    
  reason n.  常与介词for搭配
    For some reason we all have to come in early tomorrow
    The man attacked me for no reason
    
  sum n.
    a sum of
  
  determined adj.
    be determined to do 
      I'm detemined to succeed
    determine on sth/to do sth

被动语态：情态动词

英文中的态有三类，语态、时态和情态（表许可和推测、无人称变化、接动词原形）。语态是主语和动词之间的关系。主语是动作的发出者称为主动语态、是动作的承受者称为被动语态，be+done结构​

不同类型的被动态：be承担时态变化

复习情态动词现在/将来/过去的形式
  
  现在:must主观；have/has to 主观/客观      
    we must do it again       
 
  将来:must + 将来时间；will have to
    we'll have to do it again
  
  过去：had to 
    we had to do it agin    
    1、大多情况下形式：主语+must+v.ed  #无人称变化，接动词原形
    2、过去时must改为had to，形式：主语+had to+v.ed

结合上面内容用情态动词被动态造句
can/must/have(has) to be done
  your watch can be repaired
  your watch could be repaired
  your watch must have been repaired  

被动态的分类
  1、一般现在时am/is/ are done
  2、一般过去时was/ were done
  3、现在进行时am/is/ are being done
  4、过去进行时was/ were being done
  5、一般将来时will be done
  6、过去将来时would be done
  7、现在完成时have/ has been done
  8、过去完成时had been done

详情和例句：

情态动词的主动态VS被动态

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