1. The verb is being used intransitively.

2. Since the late 18th century, Commentate has been used transitively with the meaning "to annotate'' and, since the mid 19th, intransitively with the meaning "to make explanatory or critical comments.'' These …

3. Attend may be used transitively (A specialist doctor Attended me), or intransitively with a transitivizing preposition to and a special sense of responsibility and competence (A specialist doctor Attended to me)