比较while, when, as
<p> 1）<span word="as">as</span>, <span word="when">when</span> 引导短暂性动作的动词。</p><p> <span word="Just">Just</span> <span word="as">as</span> / <span word="Just">Just</span> <span word="when">when</span> / <span word="When">When</span> <span word="I">I</span> <span word="stopped">stopped</span> <span word="my">my</span> <span word="car">car</span>, <span word="a">a</span> <span word="man">man</span> <span word="came">came</span> <span word="up">up</span> <span word="to">to</span> <span word="me">me</span>.</p><p> 2）当从句的动作发生于主句动作之前，只能用<span word="when">when</span> 引导这个从句，不可用<span word="as">as</span> 或 <span word="while">while</span>。</p><p> <span word="When">When</span> <span word="you">you</span> <span word="have">have</span> <span word="finished">finished</span> <span word="your">your</span> <span word="work">work</span>, <span word="you">you</span> <span word="may">may</span> <span word="have">have</span> <span word="a">a</span> <span word="rest">rest</span>.</p><p> 3）从句表示随时间推移连词能用<span word="as">as</span>，不用<span word="when">when</span> 或<span word="while">while</span>。</p><p> <span word="As">As</span> <span word="the">the</span> <span word="day">day</span> <span word="went">went</span> <span word="on">on</span>, <span word="the">the</span> <span word="weather">weather</span> <span word="got">got</span> <span word="worse">worse</span>. </p><p> 日子一天天过去，天气越变越坏。</p>
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