Past, Present, and Future Tenses

You will enjoy this book about inventions.

• past
• present
• future

Inventors create new machines.

• past
• present
• future

Each machine does a different task.

• past
• present
• future

In the past, people invented steam engines.

• past
• present
• future

Later, other people made computers.

• past
• present
• future

Today, inventors work on new energy sources.

• past
• present
• future

They think of saving the environment.

• past
• present
• future

Perhaps they will succeed someday.

• past
• present
• future

I will invent a bed-making machine.

• past
• present
• future

It will save me much work.

• past
• present
• future