Commas, Part V

To separate introductory clauses and phrases
If every automobile in the country were a light shade of red, we’d live in a pink-car nation.

According to some experts, solar-powered cars will soon be common.

When people start buying cars that use alternative energy sources, we will become less dependent on oil as a fuel source.


In compound sentences
Many students enjoy working on computers, so teachers are finding new ways to use them in the classroom.

Computers can be valuable in education, but many schools cannot afford enough of them.