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"Si" is a form of "si", a conjunction which is often translated as "if". "Ella" is a pronoun which is often translated as "she". Learn more about the difference between "ella" and "si" below.
ella(
eh
-
yah
)A pronoun is a word that stands in for a noun (e.g., she).
c. it (things or animals)
Esa es mi casa. Detrás de ella hay un garaje.That's my house. Behind it, there's a garage.
si(
see
)A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).