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介词in、on、at辨析1.时间：inaton地点年/月/季节/学期/世纪（大时间）eg.___1999/July/summer固定搭配eg.inthemorning/afternoon/theweekendat+几点钟：____seveno’clock固定搭配：atnoon/night/theweekend具体某一天几月几日（____May1st）星期几（____Monday）节日（____Children’sDay）某天早/午/晚____Mondaymorning/May1stafernoon固定搭配：onholiday/weekdaysin+大地方（国家/城市）inChina/Guangzhoueg.___NewYork___Beijing在...里面inthebox/theclassroom(表方位)eg.___mybag在我的书包里）___mybedroom（在我的房间里）at+小地方atschool/home/thezoo/therestauranteg.___library（在图书馆）____home（在家里）on在...上面onthetable/thedesk(表方位)eg.___thebed（在床上）___thedesk（在桌子上）