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"This" is a pronoun which is often translated as "este", and "she is my sister" is a phrase which is often translated as "es mi hermana". Learn more about the difference between "this" and "she is my sister" below.
this(
thihs
)
A pronoun is a word that stands in for a noun (e.g., she).
pronoun
a. este (masculine)
This is my father's car.Este es el coche de mi padre.
b. esta (feminine)
This is the skirt I wore last night.Esta es la falda que llevé anoche.
c. esto (neuter)
All my life I've been looking for this.Llevo toda mi vida buscando esto.
d. así
Is this enough for you or would you like a bigger piece?¿Así te llega o quieres un trozo más grande?
An adjective is a word that describes a noun (e.g., the big dog).
adjective
a. este (masculine)
This winter has been the coldest one in twenty years.Este invierno ha sido el más frío en veinte años.
b. esta (feminine)
This house brings back so many memories.Esta casa me trae tantos recuerdos.
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a. tan
I've never been this sick in my life.En mi vida había estado tan enfermo.
b. así de
The box was this big.La caja era así de grande.
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she is my sister(
shi
 
ihz
 
may
 
sihs
-
tuhr
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. es mi hermana
Let me introduce you to Melanie. She is my sister.Te presento a Melanie. Es mi hermana.
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