Usages of la fórmula
Aprender estas fórmulas no es sencillo, pero en el fondo sé que puedo lograrlo.
Learning these formulas is not simple, but deep down I know that I can achieve it.
Comprendo la fórmula en mi libro verde.
I understand the formula in my green book.
Elon.io is an online learning platform
We have an entire course teaching Spanish grammar and vocabulary.