en is commonly used for “in/on/at” depending on context, and Spanish often uses en where English would pick a more specific preposition.
Spanish usually omits subject pronouns because the verb form already shows who it is. Adding tú is possible but typically only for emphasis/contrast (and it sounds marked):
Often (though usage varies):
sofá is masculine: el sofá.
The accent marks the stress: so-FÁ. Without the accent, Spanish stress rules would push stress earlier, so the written accent ensures the correct pronunciation.
It’s a normal polite request because of por favor, but you can soften more with:
Negative commands use a different form (present subjunctive):