2016年中考英语词组辨析：for / from / since
<p> Ⅰ. 三者都能用来表示时间，但用法不同。</p><p> <span word="since">since</span> “自从”，所表示的是一个时间点。可用作介词，也可用作连词，后接时间名词或短语，或引导时间状语从句;要求前面的谓语动词或主句的谓语动词必须用完成时态，要用延续性动词。而<span word="since">since</span>引导的从句中的谓语动词通常应是短暂性的动词。若接时间，则应为点时间。如：</p><p> ① <span word="He">He</span> <span word="has">has</span> <span word="worked">worked</span> <span word="there">there</span> <span word="since">since</span>1989.</p><p> ② <span word="She">She</span> <span word="has">has</span> <span word="lived">lived</span> <span word="here">here</span> <span word="since">since</span> <span word="she">she</span> <span word="moved">moved</span> <span word="here">here</span>.</p><p> Ⅱ. <span word="from">from</span> “自从” 只用作介词，表一个事情的开始点，可用于过去、现在或将来的时态。如：</p><p> ① <span word="They">They</span> <span word="worked">worked</span> <span word="from">from</span> 7:00 <span word="to">to</span> 12:00 <span word="this">this</span> <span word="morning">morning</span>.</p><p> ② <span word="We">We</span> <span word="have">have</span> <span word="been">been</span> <span word="good">good</span> <span word="friends">friends</span> <span word="from">from</span> <span word="childhood">childhood</span>.</p><p> Ⅲ. <span word="for">for</span> 作为介词，后面接段时间，用于完成时、现在时、过去时和将来时，句中要用延续性动词。如：</p><p> ① <span word="We">We</span>’<span word="ll">ll</span> <span word="stay">stay</span> <span word="here">here</span> <span word="for">for</span> <span word="ten">ten</span> <span word="minutes">minutes</span>.我们将在这儿呆10分钟。</p><p> ② <span word="They">They</span> <span word="have">have</span> <span word="studied">studied</span> <span word="English">English</span> <span word="for">for</span> <span word="three">three</span> <span word="yeas">yeas</span>.</p>
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