小升初英语语法：情态动词
<p> 情态动词表示说话人对某一动作或状态的态度，表示可能、应当、必要等含义，但其本身词义不完全，不能独立作谓语，必须和动词原形连用。情态动词没有人称和数的变化。其否定形式一般是在情态动词后加<span word="not">not</span> (<span word="have">have</span> <span word="to">to</span>除外)，其疑问形式是将情态动词提至主语前。情态动词数量不多，但用途广泛，主要有：<span word="can">can</span>/<span word="could">could</span>, <span word="may">may</span>/<span word="might">might</span>, <span word="must">must</span>, <span word="need">need</span>, <span word="shall">shall</span>/<span word="should">should</span>, <span word="will">will</span>/<span word="would">would</span>。</p><p> 1.<span word="can">can</span>和<span word="could">could</span>的用法</p><p> (1)<span word="can">can</span>/<span word="could">could</span> 表示能力;许可;可能性等。<span word="could">could</span> 为 <span word="can">can</span> 的过去式。如：</p><p> <span word="Can">Can</span> <span word="I">I</span> <span word="use">use</span> <span word="your">your</span> <span word="bike">bike</span>?我可以用你的自行车吗?</p><p> (2)<span word="can">can</span> 用在疑问句中，表示征求意见、请求许可，答语仍用 <span word="can">can</span>; <span word="could">could</span> 用在疑问句中，比<span word="can">can</span> 更委婉、客气，是一种礼貌的说法，并不表示过去时态，答语用<span word="can">can</span>，而不能用<span word="could">could</span>。 如：</p><p> ―<span word="Could">Could</span> <span word="you">you</span> <span word="tell">tell</span> <span word="me">me</span> <span word="the">the</span> <span word="way">way</span> <span word="to">to</span> <span word="the">the</span> <span word="zoo">zoo</span>?</p><p> 你能告诉我去动物园的路吗?</p><p> ―<span word="Sorry">Sorry</span>. <span word="I">I</span> <span word="cant">cant</span>. <span word="Im">Im</span> <span word="new">new</span> <span word="here">here</span>。</p><p> 不好意思，我不知道。我是新来的。</p><p> [注意] <span word="can">can</span> 和<span word="could">could</span> 只能用于现在时和过去时两种时态，将来时中用 <span word="be">be</span> <span word="able">able</span> <span word="to">to</span>。另外， <span word="cant">cant</span> 可表示否定推测。如：</p><p> <span word="That">That</span> ______ <span word="be">be</span> <span word="Mr">Mr</span> <span word="Wang">Wang</span>. <span word="He">He</span> <span word="has">has</span> <span word="gone">gone</span> <span word="to">to</span> <span word="Beijing">Beijing</span>。</p><p> 那肯定不是王老师，他已经去北京了。</p>
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