at on in 它們在動作，日期，時間，地方上應該點用

時間, 日期 :
at ( a time)
e.g. at 3 p.m.

on ( a day, on a week day)
e.g. on 16th May, on Monday

in (a time interval)
e.g. in the evening, in the morning, in this week, in this year

地方:
in 多數要表達你o係邊..都係用呢個preposition)
a country, in a room

＊Home就特別...要用at
e.g. at home
* in my house
note the difference*

仲有 at taxi stand..bus stop...MTR station

on ( 多數在...之上)
e.g. on a desk, on the wall

some transport
e.g. I am travelling on a bus,, on a car
*但係你想講有一樣野o係car入面...就要講
my pen is in the car..

can i help you?

2007-07-04 17:55:26 補充：
sorry..唔記得左節日的special case.. at Christmason Christmas dayat x'mas eveon New Year's Eve...呢d 係要靠自己努力!

係 on Christmas Eve ,個個KERA 答錯

日期，時間:
They went to school *at six o'clock.

The meeting is *on Monday.

Her birthday is *in December.

地方:
The books are *on the table.

Please put your books *in the cupboard.

She is waiting *at the bus-stop.