江苏省无锡新领航教育咨询有限公司高中英语《It作形式主语》练习
<p> 动词不定式，动名词或主语从句作主语时，通常把它们放在谓语动词前，而用 <span word="it">it</span> 作形 式主语，放到句首，常见句型有：</p><p> 1. <span word="It">It</span> + <span word="be">be</span> + 形容词 主语从句，如： 形容词+主语从句 ，</p><p> <span word="It">It</span> <span word="is">is</span> <span word="uncertain">uncertain</span> <span word="whether">whether</span> <span word="he">he</span> <span word="can">can</span> <span word="come">come</span> <span word="to">to</span> <span word="Jenny">Jenny</span>’<span word="s">s</span> <span word="birthday">birthday</span> <span word="party">party</span> <span word="or">or</span> <span word="not">not</span>.</p><p> <span word="It">It</span> + <span word="be">be</span> + 形容词 + （<span word="for">for</span> <span word="sb">sb</span>.）+ 动词不定式 等作表语，</p><p> *这类句型常用形容词 <span word="easy">easy</span>, <span word="difficult">difficult</span>, <span word="hard">hard</span>, <span word="important">important</span>, <span word="possible">possible</span>，<span word="wise">wise</span> 等，</p><p> *为了强调不定式动作的执行者， 为了强调不定式动作的执行者，常在不定式前加 <span word="for">for</span> <span word="sb">sb</span>， 如：</p><p> <span word="It">It</span>’<span word="s">s</span> <span word="necessary">necessary</span> <span word="for">for</span> <span word="the">the</span> <span word="young">young</span> <span word="to">to</span> <span word="master">master</span> <span word="two">two</span> <span word="foreign">foreign</span> <span word="language">language</span>.</p><p> <span word="It">It</span> <span word="is">is</span> <span word="unwise">unwise</span> <span word="to">to</span> <span word="give">give</span> <span word="the">the</span> <span word="children">children</span> <span word="whatever">whatever</span> <span word="they">they</span> <span word="want">want</span>.</p><p> <span word="It">It</span> + <span word="be">be</span> + 形容词 + (<span word="of">of</span> <span word="sb">sb</span>.) + 动词不定式，</p><p> *这类形容词常是表示心理品质 性格特征的 如：<span word="kind">kind</span>, <span word="nice">nice</span> <span word="stupid">stupid</span>, <span word="clever">clever</span>, <span word="foolish">foolish</span>, <span word="polite">polite</span>, <span word="impolite">impolite</span>, <span word="silly">silly</span>, <span word="selfish">selfish</span>, <span word="considerate">considerate</span> 等。</p><p> *某人和这些形容词可以构成主系表结构。 如：</p><p> <span word="It">It</span>’<span word="s">s</span> <span word="very">very</span> <span word="kind">kind</span> <span word="of">of</span> <span word="you">you</span> <span word="to">to</span> <span word="help">help</span> <span word="me">me</span> <span word="with">with</span> <span word="the">the</span> <span word="work">work</span>. =<span word="You">You</span> <span word="are">are</span> <span word="kind">kind</span> <span word="to">to</span> <span word="help">help</span> <span word="me">me</span>.</p><p> <span word="It">It</span> <span word="seemed">seemed</span> <span word="selfish">selfish</span> <span word="of">of</span> <span word="him">him</span> <span word="not">not</span> <span word="to">to</span> <span word="share">share</span> <span word="his">his</span> <span word="dictionary">dictionary</span> <span word="with">with</span> <span word="others">others</span>.</p><p> =<span word="He">He</span> <span word="seemed">seemed</span> <span word="selfish">selfish</span> <span word="not">not</span> <span word="to">to</span> <span word="share">share</span> <span word="his">his</span> <span word="dictionary">dictionary</span> <span word="with">with</span> <span word="others">others</span>.</p><p> (3)<span word="It">It</span> + <span word="be">be</span> +名词词组 + 动词不定式，</p><p> <span word="It">It</span> <span word="is">is</span> <span word="not">not</span> <span word="a">a</span> <span word="good">good</span> <span word="habit">habit</span> <span word="to">to</span> <span word="stay">stay</span> <span word="up">up</span> <span word="too">too</span> <span word="late">late</span>.</p>
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