2010-12-02

at, on, in

This is one of the recurring doubts I have when writing in English...
Hope this helps! :)

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Prepositions of Time: at, on, and in

We use at to designate specific times.
  • The train is due at 12:15 p.m.

We use on to designate days and dates.
  • My brother is coming on Monday.
  • We're having a party on the Fourth of July.

We use in for nonspecific times during a day, a month, a season, or a year.
  • She likes to jog in the morning.
  • It's too cold in winter to run outside.
  • He started the job in 1971.
  • He's going to quit in August.

Prepositions of Place: at, on, and in

We use at for specific addresses.
  • Grammar English lives at 55 Boretz Road in Durham.

We use on to designate names of streets, avenues, etc.
  • Her house is on Boretz Road.

And we use in for the names of land-areas (towns, counties, states, countries, and continents).
  • She lives in Durham.
  • Durham is in Windham County.
  • Windham County is in Connecticut.

Source: http://grammar.ccc.commnet.edu/grammar/prepositions.htm

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