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l         英語的基本句型
ⅰ、主語＋系動詞＋表語（svp）（s—subject；v—verb；p--predicative）
e.g. the flowers（花）   are    red（紅色的）.         
主語        系動詞 表語（形容詞）
 
     e.g. i    am    a worker（工人）.
          主語 系動詞 表語(名詞)
 
    e.g. the book（書）   is    on the table（桌子）.
   主語           系動詞     表語（介詞短語結構）
 
e.g. he      looks    like his father.
主語     半系動詞      表語（介詞短語結構）
 
補充：
 
復習中需要掌握的常見半系動詞：
look（看起來好像），seem（似乎）, turn（變成），feel（覺得），get（變成），become（變成），sound（聽起來），smell（聞起來）， go（變成），remain（仍然（是））
比較：
the teacher looked at （看）the blackboard（黑板）.
that dog looks dangerous（危險的）.
 
     e.g. the truth（真相）   is    that he is a liar（說謊的人）.
             主語             系動詞            表語（從句）
 
     e.g. what（的） i want to（想要） know（指導）   is    when（什么時候） you
                主語                              系動詞        表語
will leave for（出發(fā)去...） beijing?
    
 e.g. it    is   important（重要的）      for him to be careful（仔細的）.   
          主語   系動詞   表語               真正主語
提示：
形式主語的結構也可能使用 “主系表”結構。
 
比較：
it is really（真正地） nice（令人愉快的） talking to you.
 
it is really nice having talked to you.

相關課堂練習（選自2008年職稱英語等級考試綜合c考卷）：
petitions
petitions(請愿，請愿書)have long(長期地) been a part of british political（政治的） life（生活）．anyone who wanted to change something would get a list of signatures from people who agreed to the idea and either send them to the government or deliver them personally to the prime minister’s house in london．
    they are always accepted at the door by one of the pm's officials．what happens then? nothing much，usually．but petitions have always been thought of as a useful way for those who govern to find out what the people really think．
    that’s why（為什么） the uk（英國） government （政府）launched（開辦） its“e—petition”site（網(wǎng)站） in november 2006．instead of physically collecting signatures， all（全部）anyone with an idea（想法） has to（不得不） do now（現(xiàn)在） is to make a proposal（提出建議） on the government website（網(wǎng)站），and anyone who supports （支持）the idea is free to（自由地） add （添加）his or her signature（簽名）．
    the petitions soon started to flow in． the idea （想法）was for（英國的） people to express（表達） their constructive（建設性的） ideas the british．many chose instead to express their sense of humor．
    one petitioner called on tony blair to stop the deputy prime minister eating so much”．another wanted to expel(驅逐)scotland from the united kingdom because scottish football fast never support england in the world cup．
    other petitioners called on the prime minister to abolish the monarchy．some wanted to give it more power．some wanted to oppose the united states．others wanted to leave the european union．some wanted to send more troops to iraq and others wanted them all brought home．some wanted to adopt the euro(歐元)．others wanted to keep the pound．
    yet if some petitions are not serious, others present a direct challenge to government policy．a petition calling on the government to drop plans to charge drivers for using roads has already drawn around 1．8 million signatures．in response to that，a rival petition has been posted in support of road pricing． and that is also rapidly growing．
there are about 60 million people in britain．so（因此） it is understandable（可以理解的） that the government（政府） wants to find out（查明） what people are thinking（思考）．but the problem with（關于...的問題） the e-petition site（電子請愿網(wǎng)站） seems（似乎） to be that the british（英國的） people（人） have about 70 million （百萬）opinions（觀點），and want（想要） the prime minister（首相） to hear （清）all of them．perhaps he could start a petition asking everyone to lust shut up for a while．