Preposition

Prepositions of Time - at, in, on We use: "at" for a PRECISE TIME "in" for MONTHS, YEARS, CENTURIES and LONG PERIODS "on" for DAYS and DATES

E: Hello, this is doctor Watson's clinic. How can I help you? F: Hello, this is Tyler Saunders. I'd like to make an appointment. E: OK, Mr. Saunders. How about on Tuesday at 3.30? F: I'm busy all day on Tuesday. Is Friday OK? E: Well, the doctor can see you in the morning at 9.30. F: 9.30 on Friday is fine. E: Very good, Mr Saunders. We look forward to seeing you. F: Thankyou, good bye. E: Goodbye.

Look at these examples: 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?

A: What are you doing at the weekend? B: On Saturday I'm meeting my friends at 2:00, and in the evening I'm watching a movie. On Sunday I'm not busy, so maybe we can go out together. A: That sounds great!

C: I'm so busy these days! D: How come? C: I get up at 6.30 in the morning, and I finish work at 8.00 in the evening. It's a really long day. D: You're so busy! C: I know. My boss wants our project finished in March, so we're working really hard. D: I think you need a holiday. C: Well, in the summer I have three weeks holiday. I can't wait!