I believe this is the use of buscar in the imperative not the subjunctive. I think this is the informal (negative) command form. Many forms are the same, but are not from the same parts of grammar. Subjunctive mood and the imperative mood (commands) are not the same.
The second paragraph was a copy/paste from the mini quiz. Sorry it came out so strange when saving the question/statement about the lesson.
Any negative command for informal or formal you, or any other pronoun actually, will always be conjugated in the present subjunctive form. Some people call it "negative imperative" but that results in the conjugation of the present subjunctive. This lesson is about conjugation of this tense; that's why the hints state: "conjugate x form of y verb in El Presente de Subjuntivo", and we don't mention the word "command". Not all questions in this lesson are in a command form, as the present subjunctive is used in different situations.
Hope this clarifies your doubt.
Inma. I understand your response perfectly. I haven't seen the explanation in any of the lessons that the imperative and subjunctive forms can be the same. I think the distinction between the usage as imperative and subjunctive could be made clearer.
1. The imperative mood is used to tell someone to do something in a direct manner. More simply put, sentences in the imperative mood are commands.
2. The subjunctive (el subjuntivo} is one of the three moods in Spanish, the other two being the indicative and the imperative. The subjunctive is used to express desires, doubts, the unknown, the abstract, and emotions.
These are 2 explanations from spanishdict.com. #1 is about the use of the Imperative (Command). #2 is about the use of the subjunctive.
I feel that some of the examples you are using in the subjunctive, though conjugated the same, are not subjunctive, but rather, imperative ("used to tell someone to do something in a direct manner"). To me, I feel that these are two different, distinct concepts in grammar. And it appears, to me, that spanishdict.com explains this.
Just trying to learn. Please take no offense.
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