An explanation with examples of prepositions that describe time and place.

Information and examples of using the prepositions "at," "in," and "on" to indicate time.

Prepositions indicate locations, whether physical or in time. Around, in, outside, before, during. Prepositions help us know the when and where! [0:48]

This site explains the various uses for "in," "on," and "at" in phrases referring to transportation, time, and communications (TV, radio, etc.). Also links to a practice exercise.

This page explains that changes in usage over time makes the use of prepostions in certain instances unnecessary. While they are not technically incorrect, they lead to wordiness and should not be used. Examples are provided.

Prepositions indicate the location of a thing to another thing across time or space. Prepositional phrases contain a preposition and its object. [0:44]