一.in,on在方位名词前的区别 1.in表示A地在B地范围之内.如: Taiwan is in the southeast of China. 2.on表示A地与B地接壤、毗邻.如: North Korea is on the east of China. 二.at,in,on在表示时间上的区别 1.at指时间表示: (1)时间的一点、时刻等.如: They came home at sunrise (at noon,at midnight,at ten o'clock,at daybreak,at dawn). (2)较短暂的一段时间.可指某个节日或被认为是一年中标志大事的日子.如: He went home at Christmas (at New Year,at the Spring Festival,at night). 2.in指时间表示: (1)在某个较长的时间(如世纪、朝代、年、月、季节以及泛指的上午、下午或傍晚等)内.如: in 2004,in March,in spring,in the morning,in the evening,etc (2)在一段时间之后.一般情况下,用于将来时,谓语动词为瞬间动词,意为“在……以后”.如: He will arrive in two hours. 谓语动词为延续性动词时,in意为“在……以内”.如: These products will be produced in a month. 注意:after用于将来时间也指一段时间之后,但其后的时间是“一点”,而不是“一段”.如: He will arrive after two o'clock. 3.on指时间表示: (1)具体的时日和一个特定的时间,如某日、某节日、星期几等.如: On Christmas Day(On May 4th),there will be a celebration. (2)在某个特定的早晨、下午或晚上.如: He arrived at 10 o'clock on the night of the 5th. (3)准时,按时.如: If the train should be on time,I should reach home before dark. 三.at,in和on表示地点时的区别 1.at表示地点: (1)用于指较小的地方.如: I shall wait for you at the station. (2)用于门牌号码前.如: He lives at 115 Zhongshan Road. 2.in表示地点: (1)用于指较大的地方.如: He lives in Shanghai. (2)虽然是很小的地方,如果说话人住在那里,也可用in.商店、学校、机关等,若看作一个地点(point)用at,若看作一个场所(place)用in.如: I met him at the post-office. I'm now working in the post-office. 3.on表示地点,一般指与面或线接触,意为“在……上;在……旁”.如: The picture was hanging on the wall. New York is on the Hudson River. ------------------------------分割线------------------------------ on,at,in用法巧记 on,at,in这三个常用介词都可以表示时间和地点,但具体用法不同,多数学生对它们混淆不清.现在只要记住了口诀,就可避免at,on,in的种种误用. 1.on,in,at表示时间 on“在具体某一天”① “当某时”,动名词,arrival,death前;early,late位句先②,用in一般“上”“下”“晚”;on用于天,in用于月、季、年③;限定三时in要变.④at是个时间点,“工作”“时刻”与“圣诞”⑤.at noon(night),in the day,习惯用语记心间. 注: ①on表示在具体某一天及具体某一天的上午、下午和晚上. 例 On mother's Day,we should send flowers to our mother.母亲节,我们应该送花给我们的母亲. On my arrival home,I found he had gone already.当我到家时,我发现他已经走了. ② 当early,late用于句首修饰介词短语时,尽管表示具体某一天的上午、下午、晚上,都要用in,泛指一般的上、下午,晚上也用in . 例 Early in the morning of National Day,I got up to catch the first bus to the zoo. 国庆节一清早,我便起床去赶到动物园的第一班公共汽车. My father begins work at 8:00 in the morning and stops work at 4:00 in the afternoon. 我父亲上午8点上班,下午4点下班. ③于将来时态表示“过一段时间后” 及表示“在……期间” 和“在某个季节,某年、某月” 都用in. 例 I hear he'll be back in a month.我听说他将于一个月后回来. In the course of the last lesson in French,little Franz was listening to the master very attentively.在那最后一堂法语课中,小弗朗兹非常用心地听着老师讲. Xiao Ming was born in December of 2004.小明生于2004年12月. ④当 morning,afternoon,evening有前位定语或后置定语限定时,就不用in而用on. 例 on a hot (summer) noon 在一个炎热(夏天)的中午 on Monday morning 在星期一上午 on the morning of March 8th在3月8日上午 ⑤ 表示某时某刻及在work,Christmas前用at. 例 We get up at eight o'clock. 我们8点起床. My father are busily at work all day. 我父亲整天忙于工作. In western countries children get present from their parents at Christmas. 在西方国家,孩子们在圣诞节得到父亲给的礼物.
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