涉及it用法的五类考点
<p> 一、考查 <span word="it">it</span> 用作形式主语的用法当不定式、动名词、从句等用作主语时，为避免头重脚轻，通常在句首使用形式主语<span word="it">it</span>，而把真正的主语放在句子末尾。如：<span word="Its">Its</span> <span word="no">no</span> <span word="good">good</span> <span word="sitting">sitting</span> <span word="up">up</span> <span word="too">too</span> <span word="late">late</span>. 熬夜没有好处。</p><p> <span word="It">It</span> <span word="is">is</span> <span word="quite">quite</span> <span word="clear">clear</span> <span word="that">that</span> <span word="he">he</span> <span word="has">has</span> <span word="read">read</span> <span word="the">the</span> <span word="book">book</span>. 很显然，他读过这本书。</p><p> <span word="It">It</span> <span word="doesnt">doesnt</span> <span word="matter">matter</span> <span word="what">what</span> <span word="he">he</span> <span word="says">says</span>. 他说什么没关系。</p><p> 【特别提醒】注意<span word="it">it</span>用作形式主语的三类特殊句式：1.用作动词<span word="look">look</span>, <span word="seem">seem</span>, <span word="appear">appear</span>, <span word="happen">happen</span>, <span word="occur">occur</span>, <span word="follow">follow</span>等的主语（后接<span word="that">that</span>从句或<span word="as">as</span> <span word="if">if</span>从句）。如：<span word="It">It</span> <span word="seems">seems</span> <span word="that">that</span> <span word="he">he</span> <span word="knows">knows</span> <span word="everything">everything</span>. 他好像什么都知道。</p><p> <span word="It">It</span> （<span word="so">so</span>） <span word="happened">happened</span> <span word="that">that</span> <span word="I">I</span> <span word="had">had</span> <span word="no">no</span> <span word="money">money</span> <span word="with">with</span> <span word="me">me</span>. 碰巧我没带钱。</p><p> 2.当系表结构后接有<span word="if">if</span> 或<span word="when">when</span>引出的状语从句时，通常在系表结构前使用形式主语表示说话人对某情况的看法。如：<span word="It">It</span> <span word="was">was</span> <span word="a">a</span> <span word="great">great</span> <span word="surprise">surprise</span> <span word="to">to</span> <span word="me">me</span> <span word="when">when</span> <span word="he">he</span> <span word="did">did</span> <span word="a">a</span> <span word="thing">thing</span> <span word="like">like</span> <span word="that">that</span>. 他这样做使我很吃惊。</p><p> <span word="It">It</span> <span word="would">would</span> <span word="be">be</span> <span word="a">a</span> <span word="tragedy">tragedy</span> <span word="if">if</span> <span word="anything">anything</span> <span word="went">went</span> <span word="wrong">wrong</span>. 如果出了什么事就是一个悲剧。</p><p> 3.用于<span word="if">if</span> <span word="it">it</span> <span word="were">were</span> <span word="not">not</span> <span word="for">for</span> / <span word="if">if</span> <span word="it">it</span> <span word="hadnt">hadnt</span> <span word="been">been</span> <span word="for">for</span>（若不是因为）。如：<span word="If">If</span> <span word="it">it</span> <span word="hadnt">hadnt</span> <span word="been">been</span> <span word="for">for</span> <span word="the">the</span> <span word="freezing">freezing</span> <span word="wind">wind</span> <span word="they">they</span> <span word="could">could</span> <span word="have">have</span> <span word="reached">reached</span> <span word="the">the</span> <span word="injured">injured</span> <span word="man">man</span> <span word="in">in</span> <span word="time">time</span>. 要不是有刺骨的寒风，他们就及时赶到伤员身边了。</p><p> 二、考查 <span word="it">it</span> 用作形式宾语的用法当不定式、动名词、从句等用作宾语且其后跟有宾语补足语时，就应在宾语补足语前使用形式宾语，而将真正的宾语移至句末：<span word="We">We</span> <span word="found">found</span> <span word="it">it</span> <span word="difficult">difficult</span> <span word="to">to</span> <span word="persuade">persuade</span> <span word="her">her</span>. 我们发现很难说服她。</p>
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