您的位置:首页 > 英语语法 > 高中英语语法 > 资料详情
高中英语语法:It的用法
编辑:admin 时间:2015/6/9 9:36:39 来源:高中学习网

     It用法及其句型和固定搭配,是高中英语语法的重点、难点,又是高考英语的热点,因此应给予充分的重视,现将it用法归纳如下:

一、作人称代词

1、it代替前面(或后面)的单数名词或分句等所表示的事物。
e.g. You cannot eat your cake but have it.(it代替前面的cake)
     Although we cannot see it, there is air all around us. (it代替后面的air)
     They say he has left town, but I don’t believe it. (it代替前面They…town分句中的情况)
2、代替有生命但不能或不必分阴阳性的东西(包括婴儿)。
e.g. Yesterday we saw a big tree. It was fully twenty metres high. (it代替前面的tree)
     The baby cried because it was hungry. (it代替前面的baby)
3、在某些习惯说法中,可以代替人。
e.g. -- Someone is knocking at the door, Peter. -- Who is it? -- It’s me.
     -- Who are singing? -- It is the children.
     -- The light is still on in the lab. It must be the third-year students doing the experiment.
4、it与one的区别:这两个词都可以代表前面说过的名词,但it用于同名同物的场合;one则用于同名异物的场合。
e.g. -- Do you still have the bicycle? -- No, I have sold it.
     -- Is this knife yours? -- No. It is Xiao Zhang’s. Mine is the one on the desk.
5、it与that的区别:两词都可代替某一特定名词,但that指同一类,并非同一个。
e.g. The climate of South China is mild(温和的); I like it very much.(it指the climate of South China)
     The climate of South China is much better than that of Japan.(that指the climate)

二、作无人称代词

     it作无人称代词时,除了句中找不到它所代表的词语外,另一个特点是它后面的内容都是表示天气、时间、距离、度量衡及情况等。
    It is fine (rainy, windy, etc.).
    It is noon.
    It is a half hour’s walk to the factory.
    It is eighteen square metres in area.
    What does it matter?

三、作强调词,构成强调结构

     用以帮助改变句子结构,使句子的某一成分受到强调。“It is (was) + 所强调的成分 + that (who) + 其它成分。”在这个句型中,it本身没有词义。在使用强调句型时需注意以下几点:
     1. 请注意强调句型的特殊疑问句 
     例  When was it that he changed his mind to take part in the activity?
     2. 在强调原因状语从句时,只能强调由because所引导的从句
     例  It was because he was ill that he didn't come to school yesterday.
     3. 在强调not … until结构时必须把not与until一起放到被强调的位置上
     例  It was not until she took off her dark glasses that I realized she was my brother.
     4. 注意强调句型与定语从句的区别 
     例  It was at 7 o'clock that he came here yesterday.( 强调句型)
     It was 7 o'clock when he came here yesterday.(定语从句)


  • 上一页
  • 1
  • 2
  • 3
  • 4
  • 下一页
  • 发表评论
    * 评论内容:
    * 用户名:匿名发表 *不选请在前面输入您的昵称
    * 验证码: 验证码,看不清楚?请点击刷新验证码 *请输入4位数的验证码
     
    发表评论须知:
    一、所发文章必须遵守《互联网电子公告服务管理规定》;
    二、严禁发布供求代理信息、公司介绍、产品信息等广告宣传信息;
    三、严禁恶意重复发帖;
    四、严禁对个人、实体、民族、国家等进行漫骂、污蔑、诽谤。
    名师视频辅导