Question

write nosotros commands using the information provided.
modelo: no / cruzar / el parque
no crucemos el parque.

1. lavarse / las manos / con agua y jabón

1. no / destruir / el medio ambiente

1. no / ponerse / tristes
2. darle / las cartas / al cartero

Explanation:

To form "nosotros" commands (subjunctive mood for suggestions/commands for "we"), we use the subjunctive form of the verb. For -ar verbs, the subjunctive "nosotros" form is -emos; for -er/-ir verbs, it's -amos. Let's solve each:

1. "lavarse" is a reflexive verb, "nosotros" form of "lavarse" (subjunctive) is "lavémonos". The structure is [Verb (subjunctive, reflexive)] + [object] + [prepositional phrase]. So "Lavémonos las manos con agua y jabón."

1. "destruir" is an -ir verb, subjunctive "nosotros" form is "destruyamos". With "no", it's "No destruyamos el medio ambiente."

1. "ponerse" is a reflexive verb, subjunctive "nosotros" form is "pongámonos". With "no", "No pongámonos tristes."

1. "darle" (dar + le) for "nosotros", the subjunctive form of "dar" is "demos". So "Demosle las cartas al cartero." (Note: "darle" with "nosotros" is "demosle" or "demos las cartas al cartero" (since "le" is the indirect object, we can also structure it as "Demos las cartas al cartero" (the "le" is included in "darle", so "Demosle las cartas al cartero" or "Demos las cartas al cartero" (but more accurately with the indirect object: "Demosle las cartas al cartero" or "Demos las cartas al cartero" – the correct subjunctive "nosotros" form of "dar" is "demos", so "Demosle las cartas al cartero" or "Demos las cartas al cartero" (the "le" is for "al cartero", so "Demos las cartas al cartero" (since "darle" is "dar + le", so "demosle" is correct, but "demos las cartas al cartero" is also correct as "al cartero" is the indirect object).

Answer:

1. Lavémonos las manos con agua y jabón.
2. No destruyamos el medio ambiente.
3. No pongámonos tristes.
4. Demosle las cartas al cartero (or Demos las cartas al cartero)