⑤表示工具、方法、手段、根据的介词by、in、on、over、through的区别:by后的工具名词是泛指,故工具名词前不加冠词,也不用复数;而in或 on或over后接某一具体的工具名词,故要用冠词,例如:He came here by train(on/in a train);She went there by car(in a car);He came here on the first train ; Tom used to go to school by bike(on his ownon a horse);I received the news by radio(on/over/through the radio);He got the book through the library.但是当by指凭借、根据之意时,其后要用冠词the,例如:The cloth is sold by the yard;I am paid by the week。
⑥at、on、in接时间名词和地点名词的区别:at后一般接表示时刻、时点和noon、night、Christmas等类时间名词;on后一般接表示某一天的名词,但是当evening、morning、afternoon、noon和night等名词的前后有形容词或限制词修饰时就用on,例如:He came here in the morning (at night); He came here on a cold morning/night; He came here on the afternoon of March 1st;介词in后一般接表示年、月、周、季节、世纪、一生等较长时段的时间名词,如:He did a lot of work in his life;I will finish the work in a month/week/year。但是要注意当表示时间的名词前有this、that、last、next等修饰时,该时间名词前不能再用介词,例如:Last week he came here;He started(不能用on) that morning。在表示一个小的位置点时,一般用at ;而表示在里面或一个较大的地方时,用in,例如:He arrived at the station yesterday;
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