2017届高考英语一轮复习方案精品课件：第11讲 Unit 2《Sports events》（牛津译林版必修4）
<p> <span word="We">We</span> <span word="must">must</span> <span word="work">work</span> <span word="hard">hard</span> <span word="to">to</span> <span word="gain">gain</span> <span word="more">more</span> <span word="knowledge">knowledge</span> <span word="while">while</span> <span word="we">we</span> <span word="are">are</span> <span word="young">young</span>. 趁着现在还年轻，我们必须刻苦学习，获得更多的知识。 <span word="While">While</span> <span word="I">I</span> <span word="believe">believe</span> <span word="it">it</span> <span word="is">is</span> <span word="true">true</span>, <span word="I">I</span> <span word="cannot">cannot</span> <span word="prove">prove</span> <span word="it">it</span>. 虽然我相信那是真的，但我无法证明。 【易混辨析】 <span word="as">as</span>，<span word="while">while</span>和<span word="when">when</span> 三者都有“当……时候”的意思，注意以下用法与区别： (1) 若主句表示的是一个短暂性的动作，而从句表示的是一个 持续性动作时，三者都可用。 第11讲 │ 句型透视</p><p> <span word="He">He</span> <span word="fell">fell</span> <span word="asleep">asleep</span> <span word="when">when</span>/<span word="while">while</span>/<span word="as">as</span> <span word="he">he</span> <span word="was">was</span> <span word="reading">reading</span>.</p><p> 他看书时睡着了。</p><p> <span word="I">I</span> <span word="met">met</span> <span word="him">him</span> <span word="when">when</span>/<span word="as">as</span>/<span word="while">while</span> <span word="I">I</span> <span word="was">was</span> <span word="taking">taking</span> <span word="a">a</span> <span word="walk">walk</span> <span word="in">in</span> <span word="the">the</span> <span word="park">park</span>.</p><p> 我在公园散步时遇到了他。</p><p> 注：<span word="as">as</span> 用于引出一个持续性动词表示“在……期间”时，其谓语通常只能是那些含有动作(<span word="action">action</span>)和发展(<span word="development">development</span>) 意味的动词，一般不能是那些不用于进行时态的动词(如 <span word="be">be</span>, <span word="seem">seem</span>, <span word="love">love</span>, <span word="want">want</span>, <span word="agree">agree</span>, <span word="see">see</span>, <span word="know">know</span>, <span word="have">have</span> 等)，所以下面一句中的 <span word="while">while</span> 不能换为 <span word="as">as</span>：</p><p> —<span word="I">I</span>’<span word="m">m</span> <span word="going">going</span> <span word="to">to</span> <span word="the">the</span> <span word="post">post</span> <span word="office">office</span>.</p><p> ——我要去邮局。 第11讲 │ 句型透视</p><p> —<span word="While">While</span> <span word="you">you</span> <span word="are">are</span> <span word="there">there</span>, <span word="can">can</span> <span word="you">you</span> <span word="get">get</span> <span word="me">me</span> <span word="some">some</span> <span word="stamps">stamps</span>?</p><p> —当你到邮局时，能帮我买几张邮票吗？ (2) 若主、从句表示两个同时进行的持续性动作，且强调主句表示的动作延续到从句所指的整个时间，通常要用 <span word="while">while</span>；但是，若主、从句表示的两个同时进行的动作含有“一边……一边……”之意时，通常要用 <span word="as">as</span>。</p>
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