Compare and contrast:
cats/dogs
They can both be pets.
One is a canine (dog). They bark.
One is a feline (cat). They meow.
Compare/contrast math and reading.
Math uses numbers and sometimes words (for algebra).
Reading uses words.
Both are subjects in school.
Compare/contrast night and day.
Night and day are both part of our daily habits.
Night is dark, and we usually sleep. Day is light, and we usually work, play, or go to school.
Compare/contrast cows and horses.
They both are found on farms.
Cows produce milk that people drink.
Horses can be ridden.
Compare/contrast pencils and pens.
Pencils are erasable. Pens are permanent, using ink.
Both can be used to write/draw.
Compare/contrast trees and grass.
Trees and grass are both types of plants.
Trees usually are tall. Grass can get long, but grows on the ground.
Compare/contrast mice and rats.
They are both rodents.
Mice are small.
Rats are large.
Compare/contrast recess and gym.
Recess is informal. Gym is a class.
Compare/contrast rain and snow.
Rain is wet, and usually not too cold.
Snow can be wet, but is cold.
Rain cannot melt, but can evaporate.
Snow melts before it evaporates.
Compare/contrast zebras and donkeys.
Zebras are found in zoos or in the wild in Africa.
Donkeys are found on farms.
They're both horse-like.
Compare/contrast cafeteria lunch and bringing your own lunch.
You/your parents can control what you have for a lunch brought from home.
Flowers are usually planted on purpose.
Weeds grow wherever their seeds land, and not planted on purpose.
Bonus: Name two weeds and two flowers.
Weeds: dandelions and clover.
Flowers: tulips and roses.
Compare/contrast sharks and dolphins.
Sharks are fish. Dolphins are mammals.
They both live in the ocean.
Friends and classmates can both be found at school.
You like your friends. You may not like your classmates.
Compare/contrast the ocean and a lake.
Oceans are salt-water. Lakes are usually fresh water.
Oceans are usually quite large.
Most lakes are not too big (note: the Great Lakes and a few others are exceptions.)