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- at은 시점, 나이를 나타내고, on은 날짜를 나타낸다.
at dawn, at six, at midnight
at sixteen, at the age of sixteen
on Monday, on June 4, on Christmas Day
- by와 before
by는 그 시간/날짜 이전을 함축하며, 흔히 완료와 함께 쓰인다.
The train starts at 6:10, so you had better be at the station by 6:00.
By the end of July I'll have read all those books.
- on/in time
on time은 정해진 그 시점을 나타내며, in time은 늦지 않음을 나타낸다. in good time은 여유있음을 나타낸다.
The 8:15 train started on time.
Passengers should be in time for their train.
I arrived at the concert hall in good time.
- at the beginning, at the end는 문자 그대로 처음과 마지막을 나타낸다.
At the beginning of a book there is often a table of contents.
At the end there may be an index.
in the beginning과 at first는 나중에 변하였다는 것을 함축한다.
In the beginning we used hand tools. Later we had machines.
in the end/at last는 결국을 뜻한다.
At first he opposed the marriage, but in the end he gae his consent.