The word 'serious' is an adjective, used to describe a noun, or as the object of a linking verb as a predicate adjective. Example sentences:
Fraud is a serious criminal offence.
All jape aside, death is a really serious subject. Richard is known to jape when he doesn't have a proper answer.
The verb in the sentence is: isThe verb 'is' is functioning as a linking verb, the object of the verb restates the subject (whiz = he).
consequently, you can no longer eat spinach.
Children have such a resiliency, even when suffering from a serious illness.
Fraud is a serious criminal offence.
Overgrazing has caused serious degeneration of grassland.
the judge explained that because his offence was so serious,his prison sentence was protracted.
I was sure the the principal would summon me for a serious talk after what I did.
He has a serious mental disorder.
Habitual lying is a serious weakness in a person's character.
You are a serious contender for the Dumbest Question Ever Award.
This is a very serious accusation.He was involved in a serious collision.She wasn't very serious.I shot him a serious glare from across the room.
the lady was really serious
some of the serious accidents are due to unguarded stairway floor openings.
The look on her face was very serious.The injuries are very serious.If you don't take your school work serious no good will come to you in life.I'm serious I didn't do it!
you serious? if ur not then... wow. anyways, you can use in it a sentence like this "the percentage of people with silver cars in our school is 20%" if that's what you mean