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QUICK ANSWER
"Estoy trabajando" is a form of "estoy trabajando", a phrase which is often translated as "I'm working". "Si" is a form of "si", a conjunction which is often translated as "if". Learn more about the difference between "estoy trabajando" and "si" below.
estoy trabajando()
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. I'm working
Estoy trabajando en un nuevo proyecto con un equipo excelente.I'm working on a new project with a great team.
si()
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).
