1. An extra day would need to be added to each year. This day, "World's Day," is formally called "W December," observed following the last day of December.
My book says 'being' is omitted in front of 'observed' which I don't understand.
How should I serve that part?
Top answer
What do you mean by 'serve that part'?
— Mister Micawber
What do you mean by 'serve that part'?
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When I saw the commantary about the elision in my book, I did not understand why it says 'being' is elided; I don't even know how to restore a original sentence with 'being.