they must be

they must be(
they
 
muhst
 
bi
)
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1. (they need to be; used to indicate a permanent quality)
a. deben ser
They must be catholics to be accepted at the school.Deben ser católicos para ser admitidos al colegio.
b. tienen que ser
They must be strong for this type of work.Tienen que ser fuertes para este tipo de trabajo.
2. (they need to be; used to indicate a temporary state)
a. deben estar
Alejandro and Nestor know they must be on their guard in that part of the city.Alejandro y Néstor saben que deben estar en guardia en esa parte de la ciudad.
b. tienen que estar
They must be here on time.Tienen que estar aquí a tiempo.
3. (I suppose they are; used to indicate a permanent quality)
a. deben de ser
Those guys look really similar. They must be brothers.Esos muchachos se parecen mucho. Deben de ser hermanos.
b. tienen que ser
Those two are wearing name tags. They must be employees here.Esos dos tienen gafetes. Tienen que ser empleados de aquí.
c. deben ser
All four of them were carrying instrument cases. They must be musicians.Los cuatro llevaban estuches de instrumentos. Deben ser músicos.
4. (I suppose they are; used to indicate a temporary state)
a. deben de estar
Give your friends something to eat. They must be hungry.Dales algo de comer a tus amigos. Deben de estar hambrientos.
b. tienen que estar
Your kids have had a long day. They must be tired.Tus hijos han tenido un día largo. Tienen que estar cansados.
c. deben estar
I crashed my parents car yesterday. - Wow, they must be relieved that you're OK.Ayer estrellé el carro de mis padres. - Guau, deben estar aliviados de que no te pasara nada.
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