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QUICK ANSWER
"Sí" is a form of "sí", an adverb which is often translated as "yes". "Pienso" is a form of "pienso", a noun which is often translated as "fodder". Learn more about the difference between "sí" and "pienso" below.
sí(
see
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
a. yes
¿Quieres ir al cine? - Sí, pero primero hay que comer.Do you want to go to the movies? - Yes, but let's eat first.
2. (emphatic)
a. no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
Yo sí quiero acompañarlos a Disney.I do want to go with you to Disney World.
Ella no aprobó, pero yo sí.She didn't pass, but I did.
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
A pronoun is a word that stands in for a noun (e.g., she).
a. himself (third person singular masculine)
Suele jugar ajedrez con sí mismo.He usually plays chess against himself.
b. herself (third person singular feminine)
¡Se envió una carta a sí misma!She sent a letter to herself!
c. itself (third person singular)
El hilo se está enredando en sí.The string is getting tangled up in itself.
e. yourself (second person singular formal)
Solo desea el bien para sí.You only wish good for yourself.
f. yourselves (second person plural formal)
¡Solo tienen que creer en sí mismos!You just have to believe in yourselves!
el pienso(
pyehn
-
soh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. fodder
El veterinario me recomendó dar de comer a los animales otro tipo de pienso.The vet recommended that I should give the animals a different kind of fodder.
b. feed
Los cerdos ibéricos de primera comen bellotas y hierba en vez de pienso.First-class Iberian pigs eat acorns and grass instead of feed.
a. dry kibble (United States)
Regionalism used in the United States
Toby debe comer pienso especial porque lo esterilizamos hace poco.Toby needs to eat special dry kibble because we had him neutered recently.
b. dry dog food (for dogs) (United Kingdom)
Regionalism used in the United Kingdom
Vendemos todas las mejores marcas de pienso para sus mascotas.We stock all the top brands of dry dog food for your pets.
c. dry cat food (for cats) (United Kingdom)
Regionalism used in the United Kingdom
Solo le doy pienso y agua a mi gatito.I just give my kitten dry cat food and water.
