vs 

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"That is to say" is a phrase which is often translated as "es decir", and "that is" is a phrase which is often translated as "eso es". Learn more about the difference between "that is to say" and "that is" below.
that is to say(
thaht
 
ihz
 
tu
 
sey
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. es decir
I don't want to spend time with anyone else. That is to say, I love you.No quiero pasar tiempo con nadie más. Es decir, te amo.
b. o sea
We, that is to say, the teachers at this school, want to thank the students for all their hard work.Nosotros, o sea, los maestros de esta escuela, queremos agradecer a los estudiantes por todo su arduo trabajo.
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that is(
thaht
 
ihz
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. eso es
Apparently that is what he wants to wear for the dance.Aparentemente eso es lo que se quiere poner para el baile.
a. es decir
I can work with Andrés, that is, if he wants to work with me.Puedo trabajar con Andrés, es decir, si él quiere trabajar conmigo.
b. o sea
I didn't really like her, that is, I'm not sure she's right for this position.No me cayó muy bien, o sea, no estoy seguro de que sea apropiada para este puesto.
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