at : 在……时候,在……地方等,比如,at my home, at that time.in :“在……里面,在……(某段时间)期间,在……地方”等,比如,in those years, in a car.on : “在……上面,在……情况下”等,比如,on the desk, on condition that……
of : 一般是表示“属于……的,有……的性质”等,比如,He's a friend of mine.for : “为了,给,替”等意思,比如,I'm doing this for you.with: 和……(某人),关于……(事)等,比如,I wantto go with you.to :...
三个都可以用于时间前in the evening/ morning/ afternoon, 跟季节in spring/summer/autumn/winter跟月份: in January/ March跟in an hour/ a day/ a weekon日子前用on +星期, on Monday/ Tuesday aftern...