we can actually be mutuals, i’m from chile and my native language is spanish, ofc i will help you!, 1- ¿Quién abrió la puerta?, that means “who opened the door?” I didn’t get what do you have to answer but i think if you want to say “it was me”. Is “fui yo”,please leave your username of a social media so i can talk with you more faster and then i can help you