Answer:
The statements we have to rewrite are:
Está prohibido fumar - Se prohíbe fumar
Vendemos periódicos - Se venden periódicos
Hablamos español - Se habla Español
Necesitamos enfermeras - Se necesitan enfermeras
No debes nadar - No se debe nadar
Estamos buscando un auto usado - Se busca un auto usado
Step-by-step explanation:
Impersonal constructions with "se" don’t reference a specific person, but are used to make general observations about what people do. In impersonal statements there is no obvious grammatical subject, which is what makes them impersonal. In impersonal "se" constructions, verbs are always conjugated in the third person singular. You can use impersonal expressions to talk about how things are done according to custom, rule, or general consensus.