When we write, it is important to use a variety of words and expressions to convey the same idea. Instead of constantly using the phrase "was based on," we can switch it up with other synonyms. For example, we can say "derived from," "rooted in," "inspired by," "built upon," "taken from," "founded on," "established on," or "established upon." By using synonyms, we are not only making our writing more interesting, but we are also expanding our vocabulary and improving our language skills.