1. con sus vecinos / (ustedes) / ser / respetuosos 2. no ensuciar / (ustedes) / los espacios comunes / por favor 3. mantener / sus balcones / limpios / (ustedes) 4. no poner / la basura / en el pasillo

1) sean respetuosos con sus vecinos

2) no ensucien los espacios comunes por favor

3) mantengan sus balcones limpios

4) no pongan la basura en el pasillo

Explanation:

In Spanish, the 3rd person (singular and plural) of the present subjunctive is used to form the formal mandates.

In informal mandates, the 3rd person singular of the present indicative is used to form the affirmative mandates and the 2nd person (you) of the present subjunctive to form the negative mandates.

In the example of the formal mandate:

AFFIRMATIVE: ¡Hable!

NEGATIVE: ¡No hable!

In the example of the informal mandate:  

AFFIRMATIVE: ¡Habla!  

NEGATIVE: ¡No hables!

well, if he says unos it is 1, if he says dos, it is 2, if he says tres, it is 3, if he says cuatro, it is 4

answer: the answer is saben