" To refer to X is to allude to it. To refer X to Y is to recommend X to Y. "Referred" in your sentence is used as an adjective, I believe, and the "to" must be tagged on to preserve this particular meaning.
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ceniceroI wonder why that verb 'were' is located after preposition 'to'.were is after to by coincidence. The two words belong to different constituents of the sentence.
CalifJimStranding is obligatory in passive relative clausesHi, Jim,
AvangiSo you agree that "referred" is passive, therefore transitive?Yes. And no. The verb refer is intransitive (in the sense used in this thread). But the structure refer to is possibly transitive, or at least amenable to passivization.
Hassan ElbahiThe sentence is correct and there is no inversion, but there is a relative clause, which is confusing you.
the past participle 'reffered to' is used here as an adjective That's what I thought. [H]Avangi"Referred" in your sentence is used as an adjective, and the "to"
AvangiAre all verbs which require prepositions "prepositional verbs"? It doesn't seem possible.If they actually do require the preposition for their meaning, then yes, they are called "prepositional verbs". Examples include apply for, approve of, attend to, belong to, care for, come across, conform to, consist of, hint at, look for, object to, ref