Si yo pudiera hacerlo solo, no te habría pedido que me ayudaras, ¿no crees?If I could do it on my own, I wouldn't have asked you for help, don't you think?
Si yo pudiera decirle lo que siento por él, pero cuando lo veo enmudezco.If I were able to tell him what I feel for him, but I'm dumbstruck whenever I see him.