- AT: để chỉ thời gian chính xác (At 10 o’clock)
- IN: dùng cho tháng, năm, thế kỷ và những thời kỳ dài
- ON: cho thứ, ngày
| at | in | on |
| thời gian chính xác | tháng, năm, thế kỷ và những thời kỳ dài | thứ, ngày |
| at 3 o’clock | in May | on Sunday |
| at 10.30am | in summer | on Tuesdays |
| at noon | in the summer | on 6 March |
| at dinnertime | in 1990 | on 25 Dec. 2010 |
| at bedtime | in the 1990s | on Christmas Day |
| at sunrise | in the next century | on Independence Day |
| at sunset | in the Ice Age | on my birthday |
| at the moment | in the past/future | on New Year’s Eve |
Example
- I have a meeting at 9am.
- The shop closes at midnight.
- Jane went home at lunchtime.
- In England, it often snows in December.
- Do you think we will go to Jupiter in the future?
- There should be a lot of progress in the next century.
- Do you work on Mondays?
- Her birthday is on 20 November.
Where will you be on New Year’s Day ? Chú ý sử dụng giới từ AT trong một số cụm từ tiêu chuẩn sau:
| Expression | Example |
| at night | The stars shine at night. |
| at the weekend | I don’t usually work at the weekend. |
| at Christmas/Easter | I stay with my family at Christmas. |
| at the same time | We finished the test at the same time. |
| at present | He’s not home at present. Try later. |
Chú ý sử dụng giới từ In và ON trong một số cụm từ tiêu chuẩn sau:
| in | on |
| in the morning | on Tuesday morning |
| in the mornings | on Saturday mornings |
| in the afternoon(s) | on Sunday afternoons |
| in the evening(s) | on Monday evening |
Khi ta dùng last, next, every, this thì không dùng giới từ at, in, on nữa:
- I went to London last June. (not in last June)
- He’s coming back next Tuesday. (not on next Tuesday)
- I go home every Easter. (not at every Easter)
- We’ll call you this evening. (not in this evening)
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