Past simple. Acciones del pasado completadas.
I ate yesterday
I got married in 1989
My husband passed away last year.
Present perfect. (Accion completada recientemente, en el mismo dia, en la misma semana, y mas caracter explicativo. Cosas que acabo de hacer. Cosas que nunca he hecho)
I have just eaten, thank you.
I have been to Paris twice.
Contestacion a las preguntas,
1. Have you ever been, done...? I have never been to Mars.
2. Have you already finished? Have you done it yet?
I haven't finished yet. I haven't done it yet.
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