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"It" is a form of "it", a pronoun which is often translated as "lo". "Her" is an adjective which is often translated as "su". Learn more about the difference between "her" and "it" below.
her(
huhr
)An adjective is a word that describes a noun (e.g., the big dog).
1. (possessive)
a. su
Her children are very bright.Sus hijos son muy inteligentes.
I cannot stand her attitude any longer.Ya no puedo soportar más su actitud.
A pronoun is a word that stands in for a noun (e.g., she).
2. (personal)
it(
iht
)A pronoun is a word that stands in for a noun (e.g., she).
a. él (masculine)
Here's the envelope. There's something inside it.Aquí está el sobre. Hay algo dentro de él.
b. ella (feminine)
The child jumped into the bed, convinced that there was something under it.El niño brincó sobre la cama, convencido de que había algo debajo de ella.
4. (personal)
a. no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
I don't think it will fit in the car.No creo que cabrá dentro del coche.
It is heavier than I thought.Pesa más de lo que pensaba.
5. (impersonal)
a. no direct translation
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
It was a foggy night.Era una noche nublada.
It's raining cats and dogs out there!¡Está lloviendo a cántaros afuera!