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Concept
Inversion (linguistics)
Summary
In linguistics, inversion is any of several grammatical constructions where two expressions switch their canonical order of appearance, that is, they invert. There are several types of subject-verb inversion in English: locative inversion, directive inversion, copular inversion, and quotative inversion. The most frequent type of inversion in English is subject–auxiliary inversion in which an auxiliary verb changes places with its subject; it often occurs in questions, such as Are you coming?, with the subject you is switched with the auxiliary are. In many other languages, especially those with a freer word order than English, inversion can take place with a variety of verbs (not just auxiliaries) and with other syntactic categories as well.
When a layered constituency-based analysis of sentence structure is used, inversion often results in the discontinuity of a constituent, but that would not be the case with a flatter dependency-based analysis. In that regard, inversion has consequences similar to those of shifting.
In broad terms, one can distinguish between two major types of inversion in English that involve verbs: subject–auxiliary inversion and subject–verb inversion. The difference between these two types resides with the nature of the verb involved: whether it is an auxiliary verb or a full verb.
Subject–auxiliary inversion
The most frequently occurring type of inversion in English is subject–auxiliary inversion. The subject and auxiliary verb invert (switch positions):
a. Fred will stay.
b. Will Fred stay? - Subject–auxiliary inversion with yes/no question
a. Larry has done it.
b. What has Larry done? - Subject–auxiliary inversion with constituent question
a. Fred has helped at no point.
b. At no point has Fred helped. - Subject–auxiliary inversion with fronted expression containing negation (negative inversion)
a. If we were to surrender, ...
b. Were we to surrender, ...
Official source
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