Why is your teacher encouraging, exhorting, or even nagging you to learn roots, to study vocab, and to read with an eye and ear for language?
The reasons are manifold. Augment your vocabulary...
To become a better, more engaging writer.
To better comprehend your reading.
To confuse people.
To connect subjects (math --> English --> science).
To define unknown words more easily.
To express yourself more effectively or accurately.
To feel more confident with little words.
To feel sophisticated.
To gain access to power.
To gain knowledge--to not be clueless.
To get good grades.
To get out of a bad situation.
To have deeper, more intelligent conversations.
To have fun.
To have options when choosing a word.
To impress a date.
To know what you're being accused of or charged with.
To know your rights.
To land a better job.
To learn how to say exactly--precisely--what you mean.
To learn the history of language and culture.
To make money.
To master the English language.
To not be afraid of things you don't understand.
To place more emphasis on other words.
To protect yourself from scams or risks.
To read between the lines.
To read more expressively.
To sound intelligent.
To sound professional.
To sound smart.
To succeed in a future career.
To understand difficult subjects.
To understand more knowledgeable people.
To understand ourselves and others.
To understand politics.
And, most important:
To win at Stump Mr. Anderson.