vs 

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"Si" is a form of "si", a conjunction which is often translated as "if". "Tal vez" is a phrase which is often translated as "maybe". Learn more about the difference between "si" and "tal vez" below.
si(
see
)
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
conjunction
a. if
Si llueve mañana, cancelaremos el pícnic.If it rains tomorrow, we will cancel the picnic.
a. whether
Preguntó si me estaba divirtiendo.He asked whether I was enjoying myself.
b. if
Paco quiere saber si Laura también va a asistir.Paco wants to know if Laura is also going to attend.
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
a. B
Primero lo oí en si menor.I first heard it played in B minor.
b. ti (solfége)
Practiquemos las escalas en orden inverso: do, si, la...Let's practice scales in reverse order: do, ti, la...
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tal vez(
tahl
 
behs
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. maybe
Tal vez se le olvidó que ustedes se iban a encontrar.Maybe she forgot that you were going to meet up.
b. perhaps
¿Tal vez le gustaría una taza de té, señora?Perhaps you would like a cup of tea, ma'am?
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