It's hot. Say the opposite.
It's cold.
The car is fast. Say the opposite.
The car is slow.
He is strong. Say the opposite.
He is weak.
The bag is heavy. Say the opposite.
The bag is light.
The elephant is big. Say the opposite.
The elephant is small.
She is thin. Say the opposite.
She is fat.
The shoes are expensive. Say the opposite.
The shoes are cheap.
She is old. Say the opposite.
She is young.
He is poor. Say the opposite.
He is rich.