h₁es-

The PIE copular verb "to be," with the third-person singular *h₁és-ti yielding one of the most celeb‍​‍​‌​‌​‌​‍​‍​‍​‍​‌​‌​‌​‌​‍​‍​‍​‍​‍​‌​‍​‌​‍​‍​‌​‌​‍​‌​‍​‌​‌​‌​‌rated equations in comparative linguistics: Latin est, Greek estí, Sanskrit ásti, Hittite ēšzi, Gothic ist.

Discussion

The root *h₁es- ("to be") is the PIE copular and existential verb, occupying a foundational position in the reconstructed grammar.‍​‍​‌​‌​‌​‍​‍​‍​‍​‌​‌​‌​‌​‍​‍​‍​‍​‍​‌​‍​‌​‍​‍​‌​‌​‍​‌​‍​‌​‌​‌​‌ It appears in Pokorny (IEW 340–341), Rix (LIV²), and receives extensive treatment in Szemerényi (1996), Sihler (1995), and Watkins. The laryngeal *h₁ is reconstructed on the basis of the non-colouring of the root vowel *e — a distributional criterion central to the modern theory of laryngeals as formulated by Kuryłowicz (1935) and refined by subsequent scholarship.

The third-person singular *h₁és-ti is one of the most famous equations in comparative linguistics: Latin est, Greek estí (ἐστί), Sanskrit ásti, Old Church Slavonic jestŭ, Lithuanian ẽsti, Hittite ēšzi, Gothic ist, and Old Irish is all continue this form with minimal deviation. The first-person singular *h₁és-mi is preserved in Greek eimí (εἰμί), Sanskrit ásmi, and Hittite ēšmi. This paradigmatic agreement across geographically and chronologically diverse branches constitutes one of the strongest demonstrations of the genetic unity of the IE family.

Latin esse ("to be") continues the root in the infinitive formation. The present participle ēns (from *h₁s-ent-, zero-grade) underlies the philosophical vocabulary: essentia (coined by Cicero as a calque of Greek ousía), ēns ("being"), and their medieval and modern derivatives entity, essential, essence, absent (ab-sens, "being away"), and present (prae-sens, "being before"). Greek preserves the root in the participle ṓn (ὤν, "being"), from which ousía (οὐσία, "being, substance, essence") and ontología ("study of being") derive.

Sanskrit ásti and the full present paradigm (ásmi, ási, ásti, smás, sthá, sánti) provide the most complete attestation of the PIE inflection. The present participle sánt- ("being, existing") yields the philosophical term sat ("truth, existence, being"), fundamental to Indian thought in compounds such as satya ("truth") and in the Upanishadic formula sat-cit-ānanda. The Hittite forms ēšmi (first singular) and ēšzi (third singular) extend the evidence to Anatolian, the earliest attested IE branch.

In Germanic, the inherited root survives only in the third-person forms: Gothic ist, Old English is (Modern English is), and German ist. The remainder of the paradigm is suppletive, drawing on *bʰuH- (English be, been) and *h₂wes- (English was, were). This suppletive pattern, characteristic of high-frequency verbs cross-linguistically, is discussed by Ringe (2006) and has parallels in the Latin suppletive paradigm of sum/fuī/esse. The root *h₁es- thus serves both as a cornerstone of PIE grammatical reconstruction and as an illustration of the vulnerability of high-frequency paradigms to analogical restructuring and suppletion.

Laryngeal Analysis

Initial h₁, which has no colouring effect on adjacent vowels.

Ablaut

Full grade *h₁es-, zero grade *h₁s-.