Not working on Sundays is commonplace in Mordor. It's tradition.
In very short or one-word sentences the subject (noun) or the action (verb) of the sentence is implied. That means it is understood in the context of the sentence.
So, It's tradition - is a complete sentence with an implied verb - and can be separated?
" Sentences without a verb would be, for example: "Not working on Sundays? "
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The sentences, "Not working on Sundays is commonplace in Mordor." and "It's tradition.", both have a verb, "is." Sentences without a verb would be, for example:
"Not working on Sundays? In Mordor, commonplace, by tradition."