Questions & Answers about Gracias; es mejor que guardes el papel sellado en la cartera.
Because es mejor que... triggers the present subjunctive when the subject of the recommendation is a person doing an action.
- guardar (infinitive) → guardes (present subjunctive, tú form)
- guardas would be indicative (stating a fact: you keep) and sounds wrong here. You can use an infinitive, but the structure changes:
- Es mejor guardar el papel... = It’s better to keep the paper... (more general, not directly addressing “you” as strongly)
- Es mejor que guardes el papel... = It’s better that you keep the paper... (direct advice to the listener)
Guardes is the present subjunctive of guardar for tú (informal singular you). The subject pronoun tú is omitted because Spanish usually drops subject pronouns unless needed for emphasis or clarity.