Quick answer
"When you are" is a phrase which is often translated as "cuando estés", and "be happy" is an intransitive verb phrase which is often translated as "ser feliz". Learn more about the difference between "when you are" and "be happy" below.
when you are
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1. (used to address one person)
a. cuando estés
A word of phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g. How are you?).
(informal)
(singular)
Let me know when you are home.Avísame cuando estés en casa.
b. cuando seas
A word of phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g. How are you?).
(informal)
(singular)
When you are a father you will see the world differently.Cuando seas padre verás el mundo diferentemente.
c. cuando esté
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g. usted).
(formal)
(singular)
Remember to eat a lot of pasta when you are in Italy.Acuérdese de comer mucha pasta cuando esté en Italia.
d. cuando sea
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g. usted).
(formal)
You can make any changes you want when you are the CEO.Usted puede hacer los cambios que quiera cuando sea el director ejecutivo.
2. (used to address multiple people)
a. cuando estén (plural)
When you are married you will realize that love is more important than money.Cuando estén casados se darán cuenta que el amor es más importante que el dinero.
b. cuando sean (plural)
You can have girlfriends when you are older.Pueden tener novias cuando sean más grandes.
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be happy(
bi
 
hah
-
pi
)
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. (general)
a. ser feliz
I'm much happier now that I have a dog.Soy mucho más feliz ahora que tengo un perro.
b. estar feliz
I'm so happy to be here with my loved ones!¡Estoy tan feliz de estar aquí con mis seres queridos!
c. estar contento
John is happy because he passed all his classes in school.John está contento porque aprobó todas las asignaturas de la escuela.
d. alegrarse
I was so happy to hear they could come to the wedding.Me alegré mucho cuando supe que podrían venir a la boda.
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