vs 

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"Sus" is a form of "su", an adjective which is often translated as "his". "Tú" is a form of "tú", a pronoun which is often translated as "you". Learn more about the difference between "sus" and "tú" below.
su(
soo
)
An adjective is a word that describes a noun (e.g., the big dog).
adjective
a. his
A word or phrase that is masculine (e.g., el libro).
(masculine)
A word or phrase that is singular (e.g., el gato).
(singular)
¿Hiciste su tarea por él?Did you do his homework for him?
b. her
A word or phrase that is feminine (e.g., la manzana).
(feminine)
A word or phrase that is singular (e.g., el gato).
(singular)
¿Sabes dónde está el cargador de su teléfono?Do you know where the charger is for her phone?
c. its
A word or phrase that is singular (e.g., el gato).
(singular)
Esta es su perrera.This is its doghouse.
d. their
A word or phrase that is plural (e.g., los libros).
(plural)
Esa es su cena. No la comas.That is their dinner. Don't eat it.
2.
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
(formal)
(possessive; second person singular)
a. your
Nuestra casa es su casa.Our house is your house.
a. your
¿A qué hora vendrá a recogerlos su mamá?What time is your mom picking you up?
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(
too
)
A pronoun is a word that stands in for a noun (e.g., she).
pronoun
1.
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
(second person singular)
a. you
Yo, como tú, tengo que trabajar mañana.I, like you, have to work tomorrow.
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