高二英语语法总结：“It”用法及其句型和固定搭配讲解
<p> 第二章 <span word="It">It</span>用法及其句型和固定搭配讲解</p><p> <span word="It">It</span> 用法及其句型和固定搭配，是高中英语语法的重点、难点，又是近几年高考的热点，因此应给予充分的重视，现将<span word="it">it</span>用法归纳如下：</p><p> 一、<span word="It">It</span>用作实词</p><p> 表达以下概念:指代前文提到的事物，前文中的<span word="this">this</span>, <span word="that">that</span>;替代前文中的内容;指代一位性别不明的小孩或未知的人;指代未指明但谈话双方都知道的那件事;指代时间、天气、气候、距离等自然现象</p><p> 二、<span word="It">It</span>用作形式主语</p><p> 替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定式、动名词置于句尾。</p><p> <span word="It">It</span> 作形式主语的常见句型：</p><p> 1. 代作主语的动词不定式，其句型为</p><p> (1) <span word="It">It</span> <span word="be">be</span> <span word="adj">adj</span>. (<span word="for">for</span> <span word="sb">sb</span>.) <span word="to">to</span> <span word="do">do</span> <span word="sth">sth</span>.</p><p> 此处<span word="adj">adj</span>. 通常为描述事件的形容词：<span word="easy">easy</span>, <span word="difficult">difficult</span>, <span word="hard">hard</span>, <span word="necessary">necessary</span>, <span word="unnecessary">unnecessary</span>, <span word="possible">possible</span>, <span word="impossible">impossible</span>, <span word="likely">likely</span>, <span word="unlikely">unlikely</span>, <span word="right">right</span>, <span word="wrong">wrong</span>, <span word="important">important</span>, <span word="unimportant">unimportant</span>, <span word="legal">legal</span>, <span word="illegal">illegal</span>, <span word="well">well</span>-<span word="mannered">mannered</span>, <span word="ill">ill</span>-<span word="mannered">mannered</span>, <span word="polite">polite</span>, <span word="impolite">impolite</span>, <span word="clear">clear</span>, <span word="obvious">obvious</span>, <span word="certain">certain</span>, <span word="suitable">suitable</span>, <span word="proper">proper</span>, <span word="fit">fit</span>, <span word="useful">useful</span>, <span word="useless">useless</span>, <span word="dangerous">dangerous</span></p><p> 例 <span word="It">It</span> <span word="is">is</span> <span word="illegal">illegal</span> (<span word="for">for</span> <span word="a">a</span> <span word="teenager">teenager</span>) <span word="to">to</span> <span word="drive">drive</span> <span word="a">a</span> <span word="car">car</span> <span word="without">without</span> <span word="a">a</span> <span word="license">license</span>.</p><p> (2) <span word="It">It</span> <span word="be">be</span> <span word="adj">adj</span>. <span word="of">of</span> <span word="sb">sb</span>. <span word="to">to</span> <span word="do">do</span> <span word="sth">sth</span>.</p><p> 此处<span word="adj">adj</span>. 通常为描述人的形容词：<span word="kind">kind</span>, <span word="unkind">unkind</span>, <span word="nice">nice</span>, <span word="rude">rude</span>, <span word="cruel">cruel</span>, <span word="considerate">considerate</span>, <span word="thoughtful">thoughtful</span>, <span word="thoughtless">thoughtless</span>, <span word="careful">careful</span>, <span word="careless">careless</span>, <span word="silly">silly</span>, <span word="foolish">foolish</span>, <span word="stupid">stupid</span>, <span word="clever">clever</span>, <span word="wise">wise</span>, <span word="crazy">crazy</span>.</p>
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