This document discusses different ways to construct impersonal passive sentences using verbs like "be said", "be reported", and "be alleged". It notes that impersonal passive sentences can take the form of "it + be + past participle + that clause" or "subject + be + past participle + to-infinitive clause". Some example sentences are given to illustrate each construction. The document also mentions that when a that-clause begins with "that + there", an alternative passive form uses "there + be + past participle".