sou a única que

I'm the only one who

→ ser
phrase Rare #37,257
I'm the only one who Used by a female speaker; masculina would be “sou o único que.” The following verb agrees with the speaker in meaning, while “única” agrees with the feminine speaker.
PO: Sou a única que entende o que está acontecendo.
EN: I'm the only one who understands what's happening.

Sou a única que te compreende.

I'm the only one who understands you.

Sou a única que não concorda com vocês?

Am I the only one who disagrees with you?

Sou a única que o compreende.

I’m the only one who understands him.

Eu sou a única que vos compreende.

I'm the only one who understands you.

Sou a única que os entende.

I'm the only one who understands them.