Quick answer
"Whether" is a conjunction which is often translated as "si", and "either" is a conjunction which is often translated as "o". Learn more about the difference between "whether" and "either" below.
whether(
wehth
-
uhr
)
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
1. (expressing doubt or choice)
a. si
I don't know whether I am going to do it today or tomorrow. No sé si lo voy a hacer hoy o mañana.
2. (expressing inquiry)
a. si
I'll try to find out whether she's at the office.Voy a tratar de averiguar si está en la oficina.
3. (indicating something applies whichever be the case; often used with "or")
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
Alicia has made up her mind - she'll resign, whether or not she gets this other job.Alicia se decidió: va a renunciar, consiga o no el otro trabajo.
Whether you like it or not, I will buy this shirt.Te guste o no, me voy a comprar esta camisa.
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either(
ay
-
thuhr
)
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
1. (indicating two options)
a. o
Either close the door or come inside.O cierra la puerta o entra.
b. u (before a word beginning with "o/ho")
It'll take either hours or mere minutes.Se tardará u horas o unos minutos.
An adjective is a word that describes a noun (e.g. the big dog).
2. (one or another)
a. cualquiera
You can choose either glass.Puedes escoger cualquiera de los dos vasos.
b. ninguno (with a negated verb)
I don't think either team will win.No creo que gane ninguno de los dos equipos.
3. (both)
a. ambos
There was a person on either side of me on the plane.Tenía a una persona a ambos lados de mí en el avión.
b. cada
There were beautiful ferns on either side of the country lane.Había unos helechos hermosos a cada lado del sendero rural.
A pronoun is a word that stands in for a noun (e.g. she).
4. (one or another)
a. cualquiera
I like both of those popsicle flavors, so I can eat either.Me gustan las paletas de ambos sabores, así que puedo comerme cualquiera.
b. ninguno (with a negated verb)
I don't like beef or chicken sandwiches. I don't want either.No me gustan los sándwiches ni de carne ni de pollo. No quiero ninguno.
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
5. (as well)
a. tampoco (with a negated verb)
I don't like cockroaches either.No me gustan las cucarachas tampoco.
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