英语六级基础语法辅导精华情态动词
<p> 英语六级基础语法辅导精华：情态动词</p><p> 情态动词有一定的意义，表示人的看法和态度，不表示动作或状态，因而不能单独做谓语，必须和实意动词或系动词的原形一起构成谓语，没有人称和数的变化。把情态动词放在句首、句尾用问号便构成疑问句;在其后加上<span word="not">not</span>或<span word="never">never</span>等否定词就构成否定句。如：</p><p> <span word="My">My</span> <span word="mother">mother</span> <span word="can">can</span> <span word="drive">drive</span>. 我妈会开车。</p><p> <span word="My">My</span> <span word="mother">mother</span> <span word="cant">cant</span> <span word="drive">drive</span>. 我妈不会开车。</p><p> <span word="Can">Can</span> <span word="your">your</span> <span word="mother">mother</span> <span word="drive">drive</span>? 你妈会开车吗?</p><p> <span word="Cant">Cant</span> <span word="your">your</span> <span word="mother">mother</span> <span word="drive">drive</span>? 你妈不会开车吗?</p><p> <span word="You">You</span> <span word="neednt">neednt</span> <span word="look">look</span> <span word="at">at</span> <span word="me">me</span> <span word="like">like</span> <span word="that">that</span>. 你不必那样瞧着我。</p><p> 常用的情态动词有<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="should">should</span>; <span word="need">need</span>; <span word="dare">dare</span>; <span word="ought">ought</span> <span word="to">to</span> 等。</p><p> (一)<span word="can">can</span>/<span word="could">could</span> 的用法</p><p> 1、表示具备某种能力，但不一定做事情。仅仅表示有能力而已。<span word="can">can</span>表示现在;<span word="could">could</span>表示过去。如：</p><p> <span word="The">The</span> <span word="nine">nine</span>-<span word="year">year</span> <span word="old">old</span> <span word="boy">boy</span> <span word="can">can</span> <span word="swim">swim</span> <span word="across">across</span> <span word="the">the</span> <span word="river">river</span>. 那个九岁的男孩能游过那条河。</p><p> <span word="Can">Can</span> <span word="you">you</span> <span word="swim">swim</span> <span word="across">across</span> <span word="the">the</span> <span word="river">river</span>? 你能游过那条河吗?</p><p> <span word="I">I</span> <span word="could">could</span> <span word="do">do</span> <span word="such">such</span> <span word="things">things</span> <span word="then">then</span>, <span word="but">but</span> <span word="I">I</span> <span word="cant">cant</span> <span word="now">now</span>. 我那时候能做这样的事情，但现在不能了。</p><p> <span word="We">We</span> <span word="couldnt">couldnt</span> <span word="get">get</span> <span word="the">the</span> <span word="truck">truck</span> <span word="to">to</span> <span word="start">start</span>. 我们发动不了那辆卡车。</p><p> 2、表示请求(疑问句中)、允许。<span word="Could">Could</span> 比 <span word="Can">Can</span> 委婉;两者都指现在。回答一律用 <span word="can">can</span> 或 <span word="cannot">cannot</span>, 也可以用<span word="mustnt">mustnt</span>. 如：</p>
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