l         英语的基本句型
ⅰ、主语＋系动词＋表语（svp）（s—subject；v—verb；p--predicative）
e.g. the flowers（花）   are    red（红色的）.         
主语        系动词 表语（形容词）
 
     e.g. i    am    a worker（工人）.
          主语 系动词 表语(名词)
 
    e.g. the book（书）   is    on the table（桌子）.
   主语           系动词     表语（介词短语结构）
 
e.g. he      looks    like his father.
主语     半系动词      表语（介词短语结构）
 
补充：
 
复习中需要掌握的常见半系动词：
look（看起来好像），seem（似乎）, turn（变成），feel（觉得），get（变成），become（变成），sound（听起来），smell（闻起来）， go（变成），remain（仍然（是））
比较：
the teacher looked at （看）the blackboard（黑板）.
that dog looks dangerous（危险的）.
 
     e.g. the truth（真相）   is    that he is a liar（说谎的人）.
             主语             系动词            表语（从句）
 
     e.g. what（的） i want to（想要） know（指导）   is    when（什么时候） you
                主语                              系动词        表语
will leave for（出发去...） beijing?
    
 e.g. it    is   important（重要的）      for him to be careful（仔细的）.   
          主语   系动词   表语               真正主语
提示：
形式主语的结构也可能使用 “主系表”结构。
 
比较：
it is really（真正地） nice（令人愉快的） talking to you.
 
it is really nice having talked to you.

相关课堂练习（选自2008年职称英语等级考试综合c考卷）：
petitions
petitions(请愿，请愿书)have long(长期地) 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（为什么） the uk（英国） government （政府）launched（开办） its“e—petition”site（网站） in november 2006．instead of physically collecting signatures， all（全部）anyone with an idea（想法） has to（不得不） do now（现在） is to make a proposal（提出建议） on the government website（网站），and anyone who supports （支持）the idea is free to（自由地） add （添加）his or her signature（签名）．
    the petitions soon started to flow in． the idea （想法）was for（英国的） people to express（表达） their constructive（建设性的） 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(驱逐)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(欧元)．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（关于...的问题） the e-petition site（电子请愿网站） seems（似乎） to be that the british（英国的） people（人） have about 70 million （百万）opinions（观点），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．