Sentences can be constructed by using that word as an adjective or as a verb.
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America's forces are relentless in the pursuit of their enemies. The morning's drizzle became this afternoon's relentless downpour.
The earth was born eons ago
she is savings her book for poor
make five sentences with word you
make sentences using personal pronouns
Be careful where you step.
These transient tourists left rather quickly.
Sail me that Frisbee, would you? Do you sail? You sail!
The catering was fabulous! A unicorn is a fabulous beast.
That depends on the structure of the sentence and what it's about and how you set it out.