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"Si" is a form of "si", a conjunction which is often translated as "if". "Muy bien" is an interjection which is often translated as "very good". Learn more about the difference between "muy bien" and "si" below.
muy bien(
mwee
 
byehn
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. very good
¡Muy bien! Lo hiciste genial!Very good! You did great!
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. very well
Trabajamos muy bien juntos.We work very well together.
a. alright then
Ya empieza a oscurecer, así que me voy a casa. - Muy bien. Nos vemos mañana.It's getting dark already, so I'm off home. - Alright then. I'll see you tomorrow.
b. very well
A word or phrase that is seldom used in contemporary language and is recognized as being from another decade, (e.g., cat, groovy).
(old-fashioned)
No nos queda tiempo hoy. - Muy bien; lo dejamos para mañana.We don't have enough time left today. - Very well; we'll leave it for tomorrow.
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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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