since的四种用法
<p> 1) <span word="since">since</span> +过去一个时间点 (如具体的年、月、日期、钟点、1980, <span word="last">last</span> <span word="month">month</span>, <span word="half">half</span> <span word="past">past</span> <span word="six">six</span>)。</p><p> <span word="I">I</span> <span word="have">have</span> <span word="been">been</span> <span word="here">here</span> <span word="since">since</span> 1989.</p><p> </p><p> 2) <span word="since">since</span> +一段时间+ <span word="ago">ago</span></p><p> <span word="I">I</span> <span word="have">have</span> <span word="been">been</span> <span word="here">here</span> <span word="since">since</span> <span word="five">five</span> <span word="months">months</span> <span word="ago">ago</span>.<span word="http">http</span>://<span word="yingyu">yingyu</span>.<span word="chazidian">chazidian</span>.<span word="com">com</span></p><p> 3) <span word="since">since</span> +从句 </p><p> <span word="Great">Great</span> <span word="changes">changes</span> <span word="have">have</span> <span word="taken">taken</span> <span word="place">place</span> <span word="since">since</span> <span word="you">you</span> <span word="left">left</span>.</p><p> <span word="Considerable">Considerable</span> <span word="time">time</span> <span word="has">has</span> <span word="elapsed">elapsed</span> <span word="since">since</span> <span word="we">we</span> <span word="have">have</span> <span word="been">been</span> <span word="here">here</span>. </p><p> 4) <span word="It">It</span> <span word="is">is</span> +一段时间+ <span word="since">since</span>从句</p><p> <span word="It">It</span> <span word="is">is</span> <span word="two">two</span> <span word="years">years</span> <span word="since">since</span> <span word="I">I</span> <span word="became">became</span> <span word="a">a</span> <span word="postgraduate">postgraduate</span> <span word="student">student</span>.</p></p>
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