To convert the sentences to command form, you must adapt the sentences to the imperative mood as follows:
Necesitan recuperarse - <em>Recupérense</em>.
No le conviene trasnochar - <em>No se trasnoche</em>.
Es bueno que te pongas el protector solar - <em>Ponte el protector solar</em>.
Tiene que decidir ahora - <em>Decida ahora</em>.
No debemos ser tan irresponsables - <em>No seamos tan irresponsables</em>.
No quiero que ellos lo hagan - <em>Que ellos no lo hagan</em>.
<h3>What are sentences in command form?</h3>
They are those whose main verb is conjugated in the imperative mood, which is characterized by implying an order, request or mandate.
<h3>Characteristics of command sentences</h3>
The imperative mood is necessarily directed towards someone, since it is an order or request.
In the sentence <em>"Ponte el protector solar"</em> <em>(Put on sunscreen)</em> implies an order or a mandate from the speaker to the receiver.
Therefore, we can conclude that in the sentences in the form of command, a hierarchical role is manifested in which the speaker gives orders or suggestions to the person to the receiver.
para convertir una oracion a forma de mandato, debes cambiar las palabras que sugieran opcion, a palabras que directamente ordenen una accion ej. necesitan recuperarse ("necesitan" denota sugerencia en este caso) como "necesitan" esta conjugado en la tercera persona del plural se omite la palabra necesitan y el recuperarse (que acutalmente esta en infinitivo) pasa a conjugarse en tercera personal del plural.
