at: the time of the day
at five o'clock
at 11:30
at midnight
at lunch time
at sunset
on: days and dates
on Friday
on 16 May 1999
on Christmas day
on my birthday
in: longer periods
in October
in spring
in 1999
in the middle of ages
in the past
in the future
特殊:
1:不用加at/ in/ on的情况
this/ last/ next/ every
I'm leaving next Friday
2: in+ a period of 与将来时连用
it's monday, i will be phone you on Thursday
也就是说i will phone you in three days
i am going out, i will be back in an hour
3: on time 和 in time
on time 准时
the 11:30 train left on time
in time 及时
will you be home in time for dinner?
4: at the end of 和 in the end
at the end of 表示…的末尾
in the end 表示最终
I'm going away at the end of this week.
we had a few problems at first, but in the end everything was ok.
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