Quick answer
"Check in" is an intransitive verb phrase which is often translated as "registrarse", and "to" is a preposition which is often translated as "a". Learn more about the difference between "check in" and "to" below.
check in(
chehk
 
ihn
)
An intransitive verb phrase is a phrase that combines a verb with a preposition or other particle and does not require a direct object (e.g. Everybody please stand up.).
intransitive verb phrase
1. (to arrive and register)
a. registrarse (at a hotel)
We checked in at the hotel very late last night.Nos registramos en el hotel anoche muy tarde.
b. facturar (at the airport)
We have to check in before going through security.Tenemos que facturar antes de pasar por seguridad.
c. facturar el equipaje (at the airport)
Did you check in already? If not, I'll wait for you at the duty-free shops.¿Facturaste ya el equipaje? Si no, te espero en el duty-free.
d. chequear el equipaje (at the airport)
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
(Latin America)
If we don't want to miss our flight, we'll need to check in before five o'clock.Si no queremos perder el avión, tenemos que chequear el equipaje antes de las cinco.
e. chequearse (at the airport)
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
(Latin America)
Even if you don't have any luggage, you still have to check in.Incluso si no tienes equipaje, tienes que chequearte.
f. hacer el check in (at the airport)
Can you check in online?¿Se puede hacer el check in online?
g. ingresar (at a hospital)
That patient checked in on Saturday and was discharged on Monday.Esa paciente ingresó el sábado y el lunes fue dada de alta.
2. (to communicate)
Regionalism used in the United States
(United States)
a. ponerse en contacto
I'll check in with you next week to see how the project is going.Me pondré en contacto con ustedes la semana que viene para ver cómo va el proyecto.
b. llamar
I'll check in with you as soon as I get home.Te llamaré tan pronto como llegue a casa.
c. pasarse
She usually checks in before going to work.Suele pasarse antes de ir a trabajar.
A transitive verb phrase is a phrase that combines a verb with a preposition or other particle and requires a direct object (e.g. Take out the trash.).
transitive verb phrase
3. (to receive and register)
a. registrar (at a hotel)
The hotel receptionist was waiting to check us in.La recepcionista del hotel nos estaba esperando para registrarnos.
b. atender (at the airport)
The girl who checked us in at the airport was very nice and professional.La chica que nos atendió en el aeropuerto era muy simpática y profesional.
c. facturar el equipaje (at the airport)
The man who checked me in told me to hurry because they were already boarding.El señor que me facturó el equipaje me dijo que me diera prisa porque ya estaban embarcando.
d. chequear el equipaje (at the airport)
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
(Latin America)
Can you check us in, or is this desk just for those traveling in business class?¿Nos puede chequear el equipaje, o es este mostrador solo para los que viajan en business?
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to(
tu
)
A preposition is a word that indicates the relationship between a noun and another word (e.g. He ran through the door.).
1. (used to indicate direction)
a. a
I'm going to your house.Voy a tu casa.
b. hacia
She walked to the woods.Caminó hacia el bosque.
2. (as far as)
a. hasta
I would run to your house right now just to see you!¡Correría hasta tu casa ahora mismo solo para verte!
3. (in order to)
a. a
I just came to say hello.Solo vine a saludar.
4. (used to indicate belonging)
a. de
All of those books belonged to my grandfather.Todos estos libros eran de mi abuelo.
5. (used to tell the time)
a. menos
It is a quarter to six.Son las seis menos cuarto.
6. (used to indicate proportion or range)
a. por
The birth ratio is 107 boys to 100 girls.La proporción de nacimientos es de 107 niños por 100 niñas.
7. (in comparisons)
a. a
Variable A is greater or equal to variable B.La variable A es mayor o igual a la variable B.
8. (resulting in)
a. para
To my surprise, he did not recognize me.Para mi sorpresa, él no me reconoció.
9. (in toasts)
a. por
Here's to the birthday girl! Cheers!¡Por la cumpleañera! ¡Salud!
10. (used to indicate position)
a. a
Turn to the left to exit.Gira a la izquierda para salir.
11. (infinitive particle)
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
I learned to drive when I was 17.Aprendí a manejar a los 17 años.
We need to work faster.Tenemos que trabajar más rápido.
12. (used in place of a verb)
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
I didn't want to tell you but I felt I had to.No quería decírtelo pero me vi obligada a hacerlo.
It's my party and I'll cry if I want to.Es mi fiesta y lloraré si quiero.
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