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Estoy seguro de eso.

Estoy seguro de eso.
I am sure of that.
From Lesson 208:Prepositional verbs (darse cuenta de)·Spanish (Latin America)

Breakdown of Estoy seguro de eso.

eso
that (neuter)
estar seguro de
to be sure of

Questions & Answers about Estoy seguro de eso.

Why do we use de here instead of sobre or acerca de for "about"?
The adjective seguro forms a set phrase with the preposition de when you are talking about being certain of something. Just like some English verbs and adjectives lock onto specific prepositions, Spanish uses estar seguro de for "to be sure of" or "to be sure about". You must use de here regardless of how it translates into English.
Why is the word for "that" eso instead of ese or esa?
The pronoun eso is neuter. We use it when referring to an abstract concept, a situation, or a statement someone just made. If you were talking about being sure of a specific masculine noun, you might point and use ese. But since "that" here refers to a general idea or fact, it takes the neuter form eso.
Could I use soy instead of estoy here?
No, you need estar to talk about a state of mind like certainty. If you say soy seguro, it completely changes the meaning to "I am safe" or "I am a reliable person" because ser describes inherent characteristics, while estar describes states and conditions.
Does anything in this sentence change if the speaker is a woman?
Yes, a female speaker would say Estoy segura de eso. The adjective seguro describes the speaker, so it must match their gender. However, eso does not change to match the speaker because it refers to the abstract idea being discussed, which remains neuter.

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