The sentence "Es importante que dormes un poco antes de la excursión" is incorrect due to the use of the verb "dormes." In this context, the sentence is expressing a necessity or recommendation, which requires the use of the subjunctive mood in Spanish. The correct form of the verb "dormir" in the subjunctive for the second person singular (tú) is "duermas," not "dormes."
Therefore, the correct sentence should be: "Es importante que duermas un poco antes de la excursión."
Here are the reasons summarized:
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Subjunctive Mood: The phrase conveys urgency, preference, or necessity, which calls for the subjunctive mood rather than the indicative.
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Incorrect Verb Form: "Dormes" is the present indicative form of "dormir" for tú, while "duermas" is the correct present subjunctive form.
In conclusion, the correct usage aligns with the grammatical rules of Spanish regarding mood and verb conjugation.