Yes, it is correct what you think. I'm a native, I don't usually question my idiom, but thinking about it, we use "sí" as a pronoun for not repeating, but just in singular third person (himself/herself). For example: (Singular) He talk to himself = Él se habla a sí mismo. He thought to himself = El pensó para sí/ El pensó para sí mismo. ¿when use "sí" or "sí mism@"? That's collocation, not a rule. Here's another weird use: (Plural) They understand each other = Ellos se entienden entre sí/Ellos se entienden el uno al otro/Ellos se entienden el uno con el otro. (For two girls) /la una con la otra. So, it works just in plural third person, but there are other ways to say the same. Either way, you'll never find "sí" as pronoun for first and second person, singular or plural. Maybe there're other uses I can't remember. Greetings

There is another use. Condition もしお金があったら日本に行けます Si tuviera dinero, podría ir a Japón. いつもこの文章を使う Si+主語+Pretérito imperfecto del subjuntivo+名詞、主語+Pretérito Simple+名詞 スペイン語で頑張ってね

1.- I think that should be better to write: Él resuelve el problema por sí mismo. But it isn't incorrect what you have writen. 2.- It's as you say: si is if and sí is yes. I will try with an example: - Si vienes a casa te invito a comer - Vas a venir a casa? Sí, voy a ir

Hi, there is another case. ...despues de un rato volvió en si.