时间介词at、on、in
<p> 时间介系词<span word="at">at</span>, <span word="on">on</span>, <span word="in">in</span>（在）： <span word="at">at</span>表示时间的某一点;<span word="on">on</span>表示某日或和某日连用的某一时间段;<span word="in">in</span>用于表示除日以外的某一时间段。</p><p> 一.</p><p> （1） <span word="at">at</span>表示一天中的某时刻,不用冠词,如:</p><p> <span word="at">at</span> <span word="six">six</span> <span word="oclock">oclock</span>（在六点钟）, <span word="at">at</span> <span word="dawn">dawn</span>（在黎明）, <span word="at">at</span> <span word="sunrise">sunrise</span>（日出时）, <span word="at">at</span> <span word="noon">noon</span>（在正午）。</p><p> <span word="I">I</span> <span word="arrived">arrived</span> <span word="at">at</span> <span word="school">school</span> <span word="at">at</span> <span word="seven">seven</span>.</p><p> 我到学校时是七点。</p><p> （2） <span word="at">at</span>表示一瞬间或短暂的时间,如:</p><p> <span word="at">at</span> <span word="that">that</span> <span word="moment">moment</span>（在那一瞬间）,</p><p> <span word="at">at</span> <span word="present">present</span>（目前）,<span word="at">at</span> <span word="that">that</span> <span word="time">time</span>（那时）。</p><p> <span word="Your">Your</span> <span word="memory">memory</span> <span word="is">is</span> <span word="always">always</span> <span word="poor">poor</span> <span word="at">at</span> <span word="this">this</span> <span word="time">time</span>.</p><p> 你的记忆力到这时候总是不好。</p><p> （3） <span word="at">at</span>表示节日或年龄,如:</p><p> <span word="at">at</span> <span word="Christmas">Christmas</span>（在圣诞节,指整个节日）, <span word="at">at</span> <span word="the">the</span> <span word="age">age</span> <span word="of">of</span> <span word="ten">ten</span>（在十岁时）。</p><p> <span word="How">How</span> <span word="could">could</span> <span word="you">you</span> <span word="be">be</span> <span word="so">so</span> <span word="forgetful">forgetful</span> <span word="at">at</span> <span word="the">the</span> <span word="age">age</span> <span word="of">of</span> <span word="ten">ten</span>?</p><p> 你才十岁怎么就这么健忘？</p><p> 二.</p><p> <span word="on">on</span>表示某日或和某日连用的某一时间段,如:</p><p> <span word="on">on</span> <span word="Monday">Monday</span>（在星期一）, <span word="on">on</span> <span word="Friday">Friday</span> <span word="afternoon">afternoon</span>（在星期五下午）, <span word="on">on</span> <span word="the">the</span> <span word="morning">morning</span> <span word="of">of</span> <span word="August">August</span> <span word="the">the</span> <span word="eighth">eighth</span>（在八月八日早晨）, <span word="on">on</span> <span word="Christmas">Christmas</span> <span word="Day">Day</span>（在圣诞节,指在当天）。</p><p> <span word="You">You</span> <span word="were">were</span> <span word="late">late</span> <span word="on">on</span> <span word="Monday">Monday</span> <span word="last">last</span> <span word="week">week</span>.</p>
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