Grammer: Use of On & Upon
The prepositions On and upon are often interchangeable, but they differ in tone and usages. Key differences and usage "On" is common, direct and conversational, while upon is more formal, literary, or used to indicate immediate sequence and formal cause-and-effect relationships. On is used in everyday informal, or standard English. Upon is used in writing, literature, or to sound more sophisticated. Example: He placed the book on the table. -- Informal He placed the book upon the table. -- Formal. Upon signifies an event happens immediately after another, whereas on refers to a more general time. Example: Upon arrival the meeting began. (Right after arriving) Example: On Monday the meeting began (a specific date) While interchangeable, upon can imply movement, while on is commonly used for static resting position. Example: The bird landed upon the roof. Example: The bird is on the roof Some phrases strictly use either on or upon. On ...