upon

Last Updated : Jul 20, 2023 |
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You can usually replace upon with on. When you introduce a condition or event, use when instead of upon.
Preferred
Discouraged
Create a new policy list based on an existing list.
Create a new policy list based upon an existing list.
When answering the call, the attendant hears call identification tones.
Upon answering the call, the attendant hears call identification tones.