vs 

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"All of" is a phrase which is often translated as "todo", and "some of" is a phrase which is often translated as "algunos de". Learn more about the difference between "all of" and "some of" below.
all of(
al
 
uhv
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. todo
You could have all of the knowledge in the world, and talking to girls would still be difficult.Podrías tener todo el conocimiento del mundo, y hablar con las muchachas aún sería difícil.
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some of(
suhm
 
uhv
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. algunos de
Some of my professors have been teaching here for more than 30 years.Algunos de mis profesores llevan más de 30 años enseñando aquí.
b. partes de
Did you watch the movie? - Yeah, some of it.¿Viste la película? - Sí, partes de ella.
a. un poco de
Can I have some of your sandwich?¿Me das un poco de tu sándwich?
b. una parte de
I could only listen to some of the lecture before I fell asleep.Solo pude escuchar una parte de la conferencia antes de dormirme.
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