vs 

QUICK ANSWER
"What will you do" is a phrase which is often translated as "qué harás", and "what are you going to do" is a phrase which is often translated as "qué vas a hacer". Learn more about the difference between "what will you do" and "what are you going to do" below.
what will you do(
wuht
 
wihl
 
yu
 
du
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. qué harás
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
(singular)
I've been offered a job in Taiwan, but my family has to stay in Australia. - What will you do?Me han ofrecido un trabajo en Taiwán, pero mi familia tiene que quedarse en Australia. - ¿Qué harás?
b. qué hará
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
(formal)
(singular)
What will you do if the city doesn't grant the permit?¿Qué hará si la ciudad no concede el permiso?
a. qué harán (plural)
We have tickets to fly to New York, but we haven't been able to book a hotel. - What will you do?Tenemos boletos para volar a Nueva York, pero no hemos podido reservar un hotel. - ¿Qué harán?
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what are you going to do(
wuht
 
ar
 
yu
 
go
-
ihng
 
tuh
 
du
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. qué vas a hacer
What are you going to do tomorrow? Do you want to go to the movies?¿Qué vas a hacer mañana? ¿Quieres ir al cine?
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