Quick answer
"Demasiado" is an adverb which is often translated as "too", and "si" is a conjunction which is often translated as "if". Learn more about the difference between "demasiado" and "si" below.
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
1. (in excess)
a. too
No me juzgues demasiado rápido.Don't judge me too quickly.
b. too much
Si corro demasiado, me duelen las rodillas.If I run too much, my knees hurt.
An adjective is a word that describes a noun (e.g. the big dog).
2. (in excess)
a. too much (uncountable)
Fue demasiada comida para mí.It was too much food for me.
b. too many (countable)
Son demasiadas tareas para una persona.There are too many tasks for one person.
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A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
1. (with conditional clauses)
a. if
Si llueve mañana, cancelaremos el picnic.If it rains tomorrow, we will cancel the picnic.
2. (with indirect questions)
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).
3. (musical note)
a. B
Primero lo oí en si menor.I first heard it played in B minor.
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