The rats peered with derisive eyes at the terrified men.
The boy gave a derisive laugh after he purposely pushed the girl into the mud.
He sent her a derisive (mocking) email.
When it has a subject, verb, punctuation, capitalization, a predicate, and a complete thought. A sentence is a sentence when it is handed down by a judge (or a magistrate).
after the meal, the man was imbalace and fell to the ground.