语法-at/ on/ in( time)

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.