From Day 2: El piso (The flat)
Tu and mi
Tu means “your” and mi means “my”; neither changes for gender.
Hear it in the conversation
Lucía
Esta es tu habitación.
This is your room.
The accent distinguishes tú (“you”) from tu (“your”).
Notes explain it. The conversation makes it stick.
In Formula 100 you hear each phrase in a short scene first, then recall it from memory. The phrases come back in your review deck just before you’d forget them. From Week 2, you also rebuild each conversation in Spanish a week later.