In Swedish, the agent can be expressed by means of a prepositional phrase with the preposition "av" (equivalent here to the English "by"). The Austronesian language Kimaragang Dusun also indicates passive voice by verb conjugation using the infix, "-in-". Other languages, including English, express the passive voice periphrastically, using an auxiliary verb. English, like some other languages, uses a periphrastic passive. Rather than conjugating directly for voice, English uses the past participle form of the verb plus an auxiliary verb, either "be" or "get" (called linking verbs in traditional grammar), to indicate passive voice. If the agent is mentioned, it usually appears in a prepositional phrase introduced by the preposition "by". The subject of the passive voice usually corresponds to the direct object of the corresponding active-voice formulation (as in the above examples), but English also allows passive constructions in which the subject corresponds to an indirect object or preposition complement: In sentences of the second type, a stranded preposition is left. This is called the "prepositional passive" or "pseudo-passive" (although the latter term can also be used with other meanings). The active voice is the dominant voice used in English. Many commentators, notably George Orwell in his essay "Politics and the English Language" and Strunk & White in "The Elements of Style", have urged minimizing use of the passive voice, but this is almost always based on these commentators' misunderstanding of what the passive voice is. Contrary to common critiques, the passive voice has important uses, with virtually all writers using the passive voice (including Orwell and Strunk & White). There is general agreement that the passive voice is useful for emphasis, or when the receiver of the action is more important than the actor. "Merriam–Webster's Dictionary of English Usage" refers to three statistical studies of passive versus active sentences in various periodicals, stating: "the highest incidence of passive constructions was 13 percent. Orwell runs to a little over 20 percent in "Politics and the English Language". Clearly he found the construction useful in spite of his advice to avoid it as much as possible". In the field of linguistics, the term "passive" is applied to a wide range of grammatical structures. Linguists therefore find it difficult to define the term in a way that makes sense across all human languages. The canonical passive in European languages has the following properties: The problem arises with non-European languages.