Here is the corrected and rewritten passage:
It was bigger than a bus. It was as heavy as an elephant. It had a mouth full of sharp teeth, but it wasn't a monster that lived long ago. It was the Tyrannosaurus Rex. Its name means "King of the Lizards."
These dinosaurs had strong legs and thick tails. Its jaw was four feet long, which is as big as a first grader! It used its huge jaws and teeth to eat other animals. The T-rex and other dinosaurs died out millions of years ago. Today we learn about them by studying their bones.
Parent Tip: Review the logic above to help your child master the concept of 7th grade proofreading worksheet.
