Prepositions of Time

at: for a precise time.
in: for months, years, centuries and long periods.
on: for days and dates.

During: We use during +noun to say when something happens.

For: We use for + a period of time.
Since: We use since + a period of time.
Until: We use until/till to say how long a situation continues.
From-To: We use from – to +beginning and end of a period.
    • I have a class at 9 am.
    • In Morocco, it always snows in November.
    • Do you study on Mondays?
    • Last evening we watched a TV show from 2 to 8 o’clock.
    • Let’s wait until he brings the car to the front door.
    • They have known each other since they were at the kindergarten.
    • I worked with the Japanese partners for seventeen years.
  • We met a lot of interesting people during our trip.

When we say last, next, every, this we do not also use at, in, on.

  • I went to London last year. (not in last year)
  • He’s coming back next Friday. (not on next Friday)
  • I go home every weekend. (not at every weekend)
  • We’ll call you this evening. (not in this evening)

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