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"Of course" is a form of "of course", a phrase which is often translated as "por supuesto". "For sure" is an adverb which is often translated as "seguro". Learn more about the difference between "of course" and "for sure" below.
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for sure(
fuhr
shuhr
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
1. (general)
a. seguro
They left home ten minutes ago. They'll be here soon for sure.Salieron de casa hace diez minutos. Llegan pronto seguro.
b. con seguridad
I think he's studying law, but don't know for sure.Creo que estudia derecho, pero no lo sé con seguridad.
c. que no quepa la menor duda
I'm not calling him. That's for sure.Yo no lo voy a llamar. De eso que no quepa la menor duda.