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Concept
Impersonal verb
Summary
In linguistics, an impersonal verb is one that has no determinate subject. For example, in the sentence "It rains", rain is an impersonal verb and the pronoun it does not refer to anything. In many languages the verb takes a third person singular inflection and often appears with an expletive subject. In the active voice, impersonal verbs can be used to express operation of nature, mental distress, and acts with no reference to the doer. Impersonal verbs are also called weather verbs because they frequently appear in the context of weather description. Also, indefinite pronouns may be called "impersonal", as they refer to an unknown person, like one or someone, and there is overlap between the use of the two.
Impersonal verbs appear only in non-finite forms or with third-person inflection. In the third person, the subject is either implied or a dummy referring to people in general. The term "impersonal" simply means that the verb does not change according to grammatical person. In terms of valency, impersonal verbs are often avalent, as they often lack semantic arguments. In the sentence It rains, the pronoun it is a dummy subject; it is merely a syntactic placeholder—it has no concrete referent. In many other languages, there would be no subject at all. In Spanish, for example, It is raining could be expressed as simply llueve.
Temperature expressions ("it is hot"), weather expressions ("it is snowing"), and daylight expressions ("it is dark") tend to lack independent participants with distinct semantic roles. While snow participates in snowing, very few other types of participants can participate, and the participant is indistinguishable from the event itself; this is similar to the phenomenon of cognate objects. In addition, the participating snow is non-specific, and lacks a clear semantic role. Therefore, assigning the participating snow the role of 'referent' in the default English expression "it is snowing" would seem inappropriate. Instead, linguistics classify the "is snowing" in "it is snowing" as an impersonal verb.
Official source
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