英語介詞用法口訣 
       早、午、晚要用in，at黎明、午夜、點(diǎn)與分。
　　年、月、季節(jié)、周，陽光、燈、影、衣、冒in。
　　將來時(shí)態(tài)in...以后，小處at大處in。
　　有形with無形by，語言、單位、材料in。
　　特征、方面與方式，心情成語慣用in。
　　介詞at和to表方向，攻擊、位置、惡、善分。
　　
　　日子、日期、年月日，星期加上早、午、晚，
　　收音、農(nóng)場、值日on，關(guān)于、基礎(chǔ)、靠、著論。
　　著、罷、出售、偷、公、假，故意、支付、相反，準(zhǔn)。
　　特定時(shí)日和"一……就"，on后常接動(dòng)名詞。
　　年、月、日加早、午、晚，of之前on代in。
　　步行、驢、馬、玩笑on，cab，carriage則用in。 
　　
　　before、after表一點(diǎn),ago、later表一段。
　　before能接完成時(shí)，ago過去極有限。
　 

⑴ 時(shí)間或地點(diǎn)介詞in、on、at的用法區(qū)別：

      表示時(shí)間時(shí)：

in表示在一段時(shí)間里(在將來時(shí)句子中則表示在一段時(shí)間之后),                                                                               on表示在具體的某一天或者某天的上下午等,                                                                                                           at表示在某個(gè)時(shí)刻或者瞬間；

      表示地點(diǎn)時(shí)：

in表示在某個(gè)范圍之內(nèi),                                                                                                                                         on表示在某個(gè)平面上或與一個(gè)面相接觸,                                                                                                                 at則表示在某個(gè)具體的場所或地點(diǎn)。

如： I usually get up at 7：00 in the morning.(我通常在早上的七點(diǎn)鐘起床) / His glasses are right on his nose.(他的眼鏡就架在他的鼻子上)/ He is at the cinema at the moment.(此刻他正在電影院)

⑵ after與in表示時(shí)間的用法區(qū)別：                                                                                                                   “after+(具體時(shí)刻/從句)”表示“在…時(shí)刻之后”常用于一般時(shí)態(tài)；                                                                “in+(一段時(shí)間)”表示“在(多久) 之后”,常用于將來時(shí)態(tài)。                                                                                   如： My father is coming back from England in about a month.(我父親大約一個(gè)月以后從英國回來)

（3）by、in與with表示方式的用法區(qū)別：                                                                                                         都可以表示“工具、手段”,但是                                                                                                                         by主要表示“乘坐”某個(gè)交通工具或“以……方式”,在被動(dòng)句中可以表示動(dòng)作的執(zhí)行者；                                     in表示“使用”某種語言/文字,                                                                                                                             with表示“使用”某個(gè)具體的工具、手段。                                                                                                        如：We see with our eyes and walk with our feet.(我們用眼睛看東西,用雙腳走路)/ Please write that article(文章) in English.(請你用英語寫那篇文章)/ Let’s go to the zoo by taxi.(我們打的去動(dòng)物園吧。)/ It was written by Lao She.(那是老舍寫的)

（4） about與on的用法區(qū)別：                                                                                                                           都可以表示“有關(guān)…”,但是                                                                                                                            about的意義比較廣,而on主要表示“有關(guān)…(專題/課程)”。                                                                              如：Tom is going to give a talk on the history of America.(湯姆要作一個(gè)美國歷史的報(bào)告)/ They are very excited talking about the coming field trip.(他們興致勃勃地談?wù)撝磳淼降囊巴饴糜?


(5)in front of 與in the front of：                                                                                                                        in front of“在…的前面”, in the front of“在…的前部”。                                                                           如：A car was parking in front of the hall.(大廳跟前停著一輛汽車)/ In the front of the hall stood a big desk.(大廳前部立著一個(gè)大講臺)