An early gas-powered automobile

Cars were different in the 1900s than they are today. Today, many people have cars. Things were different in the early 1900s. Only a few people had cars. When we go car shopping today, there are many different kinds to choose from. In the early 1900s, there were very few cars. The first cars started by turning a crank. Cars today start by turning a key or pressing a button. People today are just like people in the 1900s. They both used cars to get where they need to go!

The topic sentence tells what you are comparing.

Support your topic sentence with details.

Signal words show how things are alike and different.