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"Himself" is a pronoun which is often translated as "él mismo", and "by himself" is a phrase which is often translated as "por su cuenta". Learn more about the difference between "himself" and "by himself" below.
himself(
hihm
-
sehlf
)
A pronoun is a word that stands in for a noun (e.g., she).
pronoun
a. él mismo
He repaired the car himself.Reparó el coche él mismo.
b. sí mismo (after preposition)
I think he's very capable of finding a job by himself.Yo le creo muy capaz de encontrar un trabajo por sí mismo.
a. se
He has to learn to dress himself.Tiene que aprender a vestirse.
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
He hasn't been himself since the accident.No se encuentra bien desde el accidente.
Your father has not been himself lately.En estos últimos tiempos, tu padre ya no es el de siempre.
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by himself(
bay
 
hihm
-
sehlf
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. por su cuenta
He wrote the essay by himself. His mother did not help.Escribió el ensayo por su cuenta. Su madre no lo ayudó.
b. por sí mismo
Josh made dinner by himself.Josh preparó la cena por sí mismo.
c. solo
Theo can fix the sink by himself. He doesn't need a technician.Theo puede reparar el lavabo solo. No necesita a un técnico.
d. a solas
Sam seems busy. Let him work by himself.Sam parece ocupado. Déjalo trabajar a solas.
a. solo
I always see Rafael eating by himself. Did he break up with his girlfriend?Siempre veo a Rafael comiendo solo. ¿Terminó con su novia?
b. a solas
When his wife doesn't want to see something, he goes to the movies by himself.Cuando su esposa no quiere ver algo, él va al cine a solas.
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