Basic textbook conversion raises a direct object. In broader syntax, some intransitives also appear in impersonal passive constructions with suitable adjuncts; that advanced rule is not the lesson focus.
Opening interactive controls...
A Nuance about Intransitives
The Passive Verb: Past, Imperfect, and Proxy Subject
Basic textbook conversion raises a direct object. In broader syntax, some intransitives also appear in impersonal passive constructions with suitable adjuncts; that advanced rule is not the lesson focus.