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介词介词(二二)三、时间介词1.after, inin + 段时间：与将来时连用。eg: My father will be back from abroad in three days.after + 段时间 = 段时间 + later , 与过去时连用。eg: He left home and went to the front after two days / two days later.注意：in the past “在过去”，与过去时连用。 in the past/ last + 时段 “在过去的中/内”，与现在完成时连用。2. .表时间的介词at, on, in, by, over, through at 在短暂的一段时间，可指在几点，一天中的黎明(at dawn),中午(at noon)，黄昏(at dusk)，夜晚(at night),也可指在某个节日或被认为是一年中标志大事的日子，在此，at表假日时间而非具体某一天。 eg: at Christmas at New Year at the Spring Festival at work在工作 on在具体某一天（如在星期几， 几月几号），具体某一天的上午，下午，晚上，或上（下）午，晚上有修饰语时。 eg: on a rainy day on National Day on Sundays = every Sunday on weekends = from Saturday to Sunday on weekdays = from Monday to Friday on Tuesday morning on March 8 on the morning of Oct.1 on a rainy night in表在某个较长的时间内，泛指在早上，上午，下午，晚上，周，月，季，年，年代，世纪，朝代 eg: in the morning/ afternoon/ evening in Qing Dynasty 注意：当early, late用于句首修饰介词短语时，尽管表具体某一天的上、下午，晚上，用in. by“不迟于（某时间）” eg: We have to be home by 10 oclock. over, through(out)两者均指经过全部的时间，“在期间”。 eg: over a cup of tea在喝一杯茶的时间 over the past 40 years 在过去的40年注意：this, that, next, last, some, every, one, each, any, all + n 结构前无介词 四、表工具，手段，方式的介词 1.用方法或方式 in this/ that/ the same way by this/ that means by means of with this/ that method 2. in, by, through in 使用语言，原料，材料，颜料，声音，钢（铅）笔，单位，现金，字体，大小写字母，交通工具，文字 eg: write in a few words简短的写 in ink = with a pen answer in a quite voice 平静的回答 in pounds按磅计算 in cash用现金 in capital letter 6. on/ upon + n. / doing “一一就就” as soon as, immediately, directly, instantly, the moment, the minute, the second, the instant, at + n. 五、其它易混介词 1. on,in 表处于某种状态 on用于表示动态，如正处在从事某种活动或处于某种运动状态之中。 on business出差 on strike在罢工 on sale 在出售 on vacation/ holiday在度假 in多用于表示静态状态，如安全，危险，健康，涉及人的情绪等。 in trouble陷入困境 in danger处于危险中 in order有序，有条理
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