adults are taking a course to learn english as a second language were asked to name their country of birth and their number of years of formal education. in example, how many variables were being stidied?

For answering to their country of birth and their number of years of formal education, they can answer:

I am from Colombia.

I was born in Colombia.

My country of birth is Colombia.

Level: Basic English

Variables studied: Simple present, simple past, verb to be, prepositions.

I have been studying for 5 years in formal education.

I have studied in formal education since 2015.

I have 5 years in formal education.

Level: Intermediate English

Variables studied: Present perfect continuous, present perfect, simple present, prepositions, time expressions.