Lemons are not red. Lemons are yellow.
Apples are red.
Carrots are not purple. Carrots are orange.
Eggplants are purple.
Grass is not blue. Grass is green.
The sky is blue.
Reindeer are not white. Reindeer are brown.
Snowmen are white.
Flamingos are not gray. Flamingos are pink.
Elephants are gray.