I can't explain why. It just happens to be one of the common uses of the verb. That is, it's both transitive and intransitive.
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AvangiCJ -- What would be the terms to describe "not middle voice"? Are there two extremes?? - A.Active voice and passive voice are "not middle voice". Actually, there is nothing in English that is a true middle voice formed with special endings, as there is in some other languages. This construction, also called "the middle alternation", is the closest t
khoffCJ -- is this the same as "ergative verbs"?I call them "Arghative" because they make me run for the exit screaming "Argh"!
CalifJimActive voice and passive voice are "not middle voice".It seems so simple.
AvangiIs it restricted to verbs which are both transitive and intransitive?It's restricted to verbs that are transitive, though the transform forces them into an intransitive state, so to speak. The object in the active form becomes the subject in the middle construction, but (unlike the passive) the verb remains in its active form. The verb now has "become
khoffCJ -- is this the same as "ergative verbs"?I looked this up in Beth Levin's book. The answer is "No". Ergative is another descriptive name for what she classifies as verbs that can undergo the "Causative/Inchoative Alternation". Example:
CalifJimThere must be a fairly obvious difference if even a non-native speaker can see itTo me, the obvious difference between "This is not selling well" and "She is not sleeping well" is the difference between the least common use of the verb in the first case and the most common use of the verb in the second case.