Good day!
PREPOSITIONS AND TIME
We use in to refer to a general, longer period of time, such as months, years, decades, or centuries. For example, we say “in April,” “in 2015” or “in the 21st century.”
Moving to shorter, more specific periods of time, we use on to talk about particular days, dates, and holidays . You may hear, “I went to work on Monday,” or “Let’s have a picnic on Memorial Day.”
For the most specific times, and for holidays without the word “day,” we use at. That means you will hear, “Meet me at midnight,” or “The flowers are in bloom at Easter time.”
PREPOSITIONS AND PLACE
We use in for the largest or most general places. You can say that “VOA is located in Washington, D.C.” And “for the best food, try the restaurants in Chinatown.”
For more specific places, like certain streets, we use the preposition on. You may know that President Obama lives on Pennsylvania Avenue in Washington, D.C.
Finally, we get to the most specific places. For exact addresses or intersections, we use the preposition at. If I invited you to visit us here at VOA, I would say, “Come to my office at 330 Independence Avenue.” To be exact, it’s at the corner of Independence and 3rd Street.”
Have a great day!