［动词不定式］不定式作主语
<p> 不定式作主语，往往用<span word="it">it</span>作形式主语，真正的主语不定式放至句子的后面。</p><p> 例如：<span word="Its">Its</span> <span word="so">so</span> <span word="nice">nice</span> <span word="to">to</span> <span word="hear">hear</span> <span word="your">your</span> <span word="voice">voice</span>. 听到你的声音真高兴。</p><p> <span word="Its">Its</span> <span word="necessary">necessary</span> <span word="for">for</span> <span word="you">you</span> <span word="to">to</span> <span word="lock">lock</span> <span word="the">the</span> <span word="car">car</span> <span word="when">when</span> <span word="you">you</span> <span word="do">do</span> <span word="not">not</span> <span word="use">use</span> <span word="it">it</span>. 不用车的时候，锁车是有必要的。</p><p> <span word="Its">Its</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="us">us</span>. 他帮助我们，他真好。</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="give">give</span> <span word="them">them</span> <span word="anything">anything</span>. 他不给他们任何东西，这显得太自私了。</p><p> 但是，用不定式作主语的句子中还有一个不定式作表语时，不能用<span word="It">It</span> <span word="is">is</span> <span word="to">to</span>的句型。另外，这样的句子，不能用动名词作表语。例如：</p><p> （对）<span word="To">To</span> <span word="teach">teach</span> <span word="is">is</span> <span word="to">to</span> <span word="learn">learn</span>.</p><p> （错）<span word="It">It</span> <span word="is">is</span> <span word="to">to</span> <span word="learn">learn</span> <span word="to">to</span> <span word="teach">teach</span>.</p><p> （错）<span word="To">To</span> <span word="teach">teach</span> <span word="is">is</span> <span word="learning">learning</span>.</p><p> （错）<span word="Teaching">Teaching</span> <span word="is">is</span> <span word="to">to</span> <span word="learn">learn</span>.</p><p> 典型例题</p><p> <span word="The">The</span> <span word="chair">chair</span> <span word="looks">looks</span> <span word="rather">rather</span> <span word="hard">hard</span>， <span word="but">but</span> <span word="in">in</span> <span word="fact">fact</span> <span word="it">it</span> <span word="is">is</span> <span word="very">very</span> <span word="comfortable">comfortable</span> <span word="to">to</span> ___.</p><p> <span word="A">A</span>. <span word="sit">sit</span> <span word="B">B</span>. <span word="sit">sit</span> <span word="on">on</span> <span word="C">C</span>. <span word="be">be</span> <span word="seat">seat</span> <span word="D">D</span>. <span word="be">be</span> <span word="sat">sat</span> <span word="on">on</span></p><p> 答案：<span word="B">B</span>. 如果不定式为不及物动词，其后应有必要的介词。当动词与介词连用时，常位于形容词+动词不定式结构的末尾。</p><p> </p>
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