Past simple = momento terminado; present perfect = pasado conectado con ahora.
Past simple
- yesterday, last…, … ago, in 2020, when I was…
- Preguntas con When…? → did
Present perfect
- ever, never, just, already, yet, so far
- for / since; this week / today si siguen abiertos
- Experiencia primero, detalles después en past simple
Errores frecuentes
- «I have seen it yesterday» ✗ → I saw it yesterday.
- «When have you arrived?» ✗ → When did you arrive?
- «Did you ever…?» para experiencias de la vida → Have you ever…?