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Concept
Ambitransitive verb
Résumé
An ambitransitive verb is a verb that is both intransitive and transitive. This verb may or may not require a direct object. English has many ambitransitive verbs. Examples include read, break, and understand (e.g., "I read the book", saying what was read, or just "I read all afternoon").
Ambitransitive verbs are common in some languages, and much less so in other languages, where valency tends to be fixed, and there are explicit valency-changing operations (such as passive voice, antipassive voice, applicatives, causatives, etc.).
Generally speaking, there are two types of ambitransitive verbs, distinguished by the alignment of the semantic roles of their arguments with their syntactic roles.
Agentive (S = A) ambitransitives are those where the single argument of the intransitive (S) is agentive and it corresponds to the agent (A) of the transitive. In Mary (S) is knitting, and Mary (A) is knitting a scarf (O), the person doing the knitting in both sentences is Mary. Likely candidates for this type of ambitransitive include those where an action can be described in general terms or with respect to a specific patient. English examples include eat, follow, help, knit, read, try, watch, win, know, and many others. These transitive versions have been called unergative verbs, but this term is not fully accepted since it is used for many other senses.
Labile verb
Patientive (S = O) ambitransitives are those where the single argument of the intransitive (S) corresponds to the object (O) of the transitive. For example, in the sentence John (S) tripped and John (A) tripped Mary (O), John is doing the falling in the first sentence. Likely candidates for this type of ambitransitive are verbs that affect an agent spontaneously, or those that can be engineered by an agent. English has bend, break, burn, burst, change, cool, enter, extend, fall, frighten, grow, hurry, melt, move, open, spill, stretch, trip, turn, twist, and many other verbs. Such verbs are also called labile verbs (or "ergative verbs").
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