Prepositions for time and space

Prepositions are used to locate something in time and space, modify a noun; or tell when or where or under what conditions something happened. The following are guidelines for using prepositions correctly. This covers many common situations.

 Prepositions of Time: at, in, on

Preposition Usage Example
At at is for specific times The exam is at 12:15 PM
In in is for nonspecific times during a day/month/year. The exam is in the morning
On on for days and dates The exam is on Monday.
The exam is on Christmas Day.

 Prepositions of Place: at, in, on

Preposition Usage Example
At We use at for specific addresses. I live at 50 Pong Lai Road.
In We use in for the names of land-areas (towns, counties, states, countries, and continents). I live in Taipei.
On We use on for the names of streets, avenues, etc. I live on Pong Lai Road.

 Prepositions for describing our work:

at company’s I work at Comtrend
in departments in the marketing department, as a technical writer.
on projects I am working on a new manual



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