I don't understand
No comprendo el significado exacto de esa frase.
I don't understand the exact meaning of that phrase.
Estuve pensando toda la noche y hay algo que no comprendo.
I was thinking all night, and there’s something I don’t understand.
— Taxi (1998)
No comprendo cómo el marido le dio el divorcio.
I don't understand how her husband gave her the divorce.
— La dolce vita (1960)
No comprendo esta confusa gramática.
I don't understand this confusing grammar.