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"Si" is a form of "si", a conjunction which is often translated as "if". "¡Claro que sí!" is an interjection which is often translated as "Of course!". Learn more about the difference between "si" and "¡Claro que sí!" below.
si(
see
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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 picnic.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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¡Claro que sí!(
klah
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roh
 
keh
 
see
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. Of course!
¿Me ayudas? - ¡Claro que sí!Could you help me? - Of course!
b. Certainly!
¿Me prestas tu bolígrafo? - ¡Claro que sí!Would you lend me your pen? - Certainly!
c. By all means!
¿Me permite usar su baño? - ¡Claro que sí!May I use your bathroom? - By all means!
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