Zero (linguistics)

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In linguistics, a zero or null is a segment that is not pronounced or written. It is a useful concept in analysis, usually written with the symbol "∅", indicating the absence of an element where one might be expected. There are several kinds of zero: In phonetics and phonology, a null phoneme or zero phone indicates that no phone is produced where one might be expected. For example, in syllable structure analysis, a null onset indicates that a syllable lacks an initial consonant (onset) that is normally required by the phonotactics of the considered language. For example, see Standard Chinese phonology#Zero onset. In morphology, a zero morph, consisting of no phonetic form, is an allomorph of a morpheme that is otherwise realized in speech. In the phrase two sheep ∅, the plural marker is a zero morph (see nouns with identical singular and plural forms), which is an allomorph of -s as in two cows. In the phrase I like-∅ it, the verb conjugation has a zero affix, as opposed to the third-person singular present -s in he likes it. In grammar, a zero pronoun occurs in some languages. In the English sentence nobody knows ∅ that the zero pronoun plays the role of the object of the verb, and in ∅ makes no difference that it plays the role of the subject. Likewise, the zero pronoun in the book ∅ I am reading plays the role of the relative pronoun in the book that I am reading. In generative grammar, this is also referred to as PRO. In pronoun-dropping languages, including null subject languages such as most Romance languages, the zero pronoun is a prominent feature. A zero subordinate conjunction occurs in English in sentences like I know ∅ he likes me, in which the zero conjunction plays the...