This is the 816th most frequent Portuguese word.
si
"Si" in Portuguese isn’t a standalone word; it could be a misspelling or a reflexive pronoun meaning "itself," "oneself," or a musical note "B."
In this sentence, 'si' is used as a reflective pronoun referring back to the subject.
Ela sempre pensa em si mesma.
She always thinks about herself.
Here, 'si' acts as a reflexive pronoun indicating the subject's trust in their own capabilities.
Confiar em si mesmo é fundamental.
Trusting oneself is fundamental.
In this example, 'si' is part of the reflexive phrase 'certificar-se'.