prepositions:

A preposition tells a reader when and where something occurred as well as how it occurred. English prepositions perform so many functions that their nuances cause quite a bit of confusion. Here are a few examples of prepositions that illustrate 14 of the most common mistakes:

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To/At
“At” tells where an object or subject is while “to” refers to another location. For example:
We arrived at the station.
Mary returned to the store.

For/Since
“For” measures time while “since” refers to a specific period. For example,
He has been traveling for five years.
He’s been with the company since it was established.

Dates and Times
Use “in