Indo-European Verbs

The Indo-European languages are a language family native to the overwhelming majority of Europe, the Iranian plateau, and the northern Indian subcontinent. Some European languages of this family, English, French, Portuguese, Russian, Dutch, and Spanish, have expanded through colonialism in the modern period and are now spoken across several continents. The Indo-European family is divided into several branches or sub-families, of which there are eight groups with languages still alive today: Albanian, Armenian, Balto-Slavic, Celtic, Germanic, Hellenic, Indo-Iranian, and Italic; and another nine subdivisions that are now extinct.

Today, the individual Indo-European languages with the most native speakers are English, Hindi–Urdu, Spanish, Bengali, French, Russian, Portuguese, German, and Punjabi, each with over 100 million native speakers; many others are small and in danger of extinction.

In total, 46% of the world's population (3.2 billion people) speaks an Indo-European language as a first language — by far the highest of any language family. There are about 445 living Indo-European languages, according to an estimate by ''Ethnologue'', with over two-thirds (313) of them belonging to the Indo-Iranian branch.

All Indo-European languages are descended from a single prehistoric language, linguistically reconstructed as Proto-Indo-European, spoken sometime in the Neolithic to Early Bronze Age. The geographical location where it was spoken, the Proto-Indo-European homeland, has been the object of many competing hypotheses; the academic consensus supports the Kurgan hypothesis, which posits the homeland to be the Pontic–Caspian steppe in what is now Ukraine and southern Russia, associated with the Yamnaya culture and other related archaeological cultures during the 4th millennium BC to early 3rd millennium BC. By the time the first written records appeared, Indo-European had already evolved into numerous languages spoken across much of Europe, South Asia, and part of Western Asia. Written evidence of Indo-European appeared during the Bronze Age in the form of Mycenaean Greek and the Anatolian languages of Hittite and Luwian. The oldest records are isolated Hittite words and names — interspersed in texts that are otherwise in the unrelated Akkadian language, a Semitic language — found in texts of the Assyrian colony of Kültepe in eastern Anatolia dating to the 20th century BC. Although no older written records of the original Proto-Indo-European population remain, some aspects of their culture and their religion can be reconstructed from later evidence in the daughter cultures. The Indo-European family is significant to the field of historical linguistics as it possesses the second-longest recorded history of any known family, after the Afroasiatic family in the form of the pre-Arab Egyptian language and the Semitic languages. The analysis of the family relationships between the Indo-European languages, and the reconstruction of their common source, was central to the development of the methodology of historical linguistics as an academic discipline in the 19th century.

The Indo-European family is not known to be linked to any other language family through any more distant genetic relationship, although several disputed proposals to that effect have been made.

History of Indo-European linguistics

During the 16th century, European visitors to the Indian subcontinent began to notice similarities among Indo-Aryan, Iranian, and European languages. In 1583, English Jesuit missionary and Konkani scholar Thomas Stephens wrote a letter from Goa to his brother (not published until the 20th century) in which he noted similarities between Indian languages and Greek and Latin.

Another account was made by Filippo Sassetti, a merchant born in Florence in 1540, who travelled to the Indian subcontinent. Writing in 1585, he noted some word similarities between Sanskrit and Italian (these included ''devaḥ''/''dio'' "God", ''sarpaḥ''/''serpe'' "serpent", ''sapta''/''sette'' "seven", ''aṣṭa''/''otto'' "eight", and ''nava''/''nove'' "nine"). However, neither Stephens' nor Sassetti's observations led to further scholarly inquiry.

In 1647, Dutch linguist and scholar Marcus Zuerius van Boxhorn noted the similarity among certain Asian and European languages and theorized that they were derived from a primitive common language which he called Scythian. He included in his hypothesis Dutch, Albanian, Greek, Latin, Persian, and German, later adding Slavic, Celtic, and Baltic languages. However, Van Boxhorn's suggestions did not become widely known and did not stimulate further research.

Ottoman Turkish traveler Evliya Çelebi visited Vienna in 1665–1666 as part of a diplomatic mission and noted a few similarities between words in German and in Persian.
Gaston Coeurdoux and others made observations of the same type. Coeurdoux made a thorough comparison of Sanskrit, Latin and Greek conjugations in the late 1760s to suggest a relationship among them. Meanwhile, Mikhail Lomonosov compared different language groups, including Slavic, Baltic (" Kurlandic"), Iranian ("Medic"), Finnish, Chinese, "Hottentot" (Khoekhoe), and others, noting that related languages (including Latin, Greek, German and Russian) must have separated in antiquity from common ancestors.M.V. Lomonosov (drafts for ''Russian Grammar'', published 1755). In: Complete Edition, Moscow, 1952, vol. 7, pp. 652–59
:
Представимъ долготу времени, которою сіи языки раздѣлились. ... Польской и россійской языкъ коль давно раздѣлились! Подумай же, когда курляндской! Подумай же, когда латинской, греч., нѣм., росс. О глубокая древность! magine the depth of time when these languages separated! ... Polish and Russian separated so long ago! Now think how long ago [this happened toKurlandic! Think when [this happened to] Latin, Greek, German, and Russian! Oh, great antiquity!]

The hypothesis reappeared in 1786 when William Jones (philologist), Sir William Jones first lectured on the striking similarities among three of the oldest languages known in his time: Latin, Greek, and Sanskrit, to which he tentatively added Gothic, Celtic, and Persian, though his classification contained some inaccuracies and omissions. In one of the most famous quotations in linguistics, Jones made the following prescient statement in a lecture to the Asiatic Society of Bengal in 1786, conjecturing the existence of an earlier ancestor language, which he called "a common source" but did not name:

Thomas Young first used the term ''Indo-European'' in 1813, deriving it from the geographical extremes of the language family: from Western Europe to North India. A synonym is Indo-Germanic (''Idg.'' or ''IdG.''), specifying the family's southeasternmost and northwesternmost branches. This first appeared in French (''indo-germanique'') in 1810 in the work of Conrad Malte-Brun; in most languages this term is now dated or less common than ''Indo-European'', although in German ''indogermanisch'' remains the standard scientific term. A number of other synonymous terms have also been used.

Franz Bopp wrote in 1816 ''On the conjugational system of the Sanskrit language compared with that of Greek, Latin, Persian and Germanic'' and between 1833 and 1852 he wrote ''Comparative Grammar''. This marks the beginning of Indo-European studies as an academic discipline. The classical phase of Indo-European comparative linguistics leads from this work to August Schleicher's 1861 ''Compendium'' and up to Karl Brugmann's '' Grundriss'', published in the 1880s. Brugmann's neogrammarian reevaluation of the field and Ferdinand de Saussure's development of the laryngeal theory may be considered the beginning of "modern" Indo-European studies. The generation of Indo-Europeanists active in the last third of the 20th century (such as Calvert Watkins, Jochem Schindler, and Helmut Rix) developed a better understanding of morphology and of ablaut in the wake of Kuryłowicz's 1956 ''Apophony in Indo-European,'' who in 1927 pointed out the existence of the Hittite consonant ḫ. Kuryłowicz's discovery supported Ferdinand de Saussure's 1879 proposal of the existence of ''coefficients sonantiques'', elements de Saussure reconstructed to account for vowel length alternations in Indo-European languages. This led to the so-called laryngeal theory, a major step forward in Indo-European linguistics and a confirmation of de Saussure's theory.

Classification

The various subgroups of the Indo-European language family include ten major branches, listed below in alphabetical order:
* Albanian, attested from the 13th century AD; Proto-Albanian evolved from an ancient Paleo-Balkan language, traditionally thought to be Illyrian, or otherwise a totally unattested Balkan Indo-European language that was closely related to Illyrian and Messapic.
* Anatolian, extinct by Late Antiquity, spoken in Anatolia, attested in isolated terms in Luwian/ Hittite mentioned in Semitic Old Assyrian texts from the 20th and 19th centuries BC, Hittite texts from about 1650 BC.
* Armenian, attested from the early 5th century AD.
* Balto-Slavic, believed by most Indo-Europeanists to form a phylogenetic unit, while a minority ascribes similarities to prolonged language-contact.
** Slavic (from Proto-Slavic), attested from the 9th century AD ( possibly earlier), earliest texts in Old Church Slavonic. Slavic languages include Bulgarian, Russian, Polish, Czech, Slovak, Silesian, Kashubian, Macedonian, Serbo-Croatian ( Bosnian, Croatian, Montenegrin, Serbian), Sorbian, Slovenian, Ukrainian, Belarusian, and Rusyn.
** Baltic, attested from the 14th century AD; although attested relatively recently, they retain many archaic features attributed to Proto-Indo-European (PIE). Living examples are Lithuanian and Latvian.
* Celtic (from Proto-Celtic), attested since the 6th century BC; Lepontic inscriptions date as early as the 6th century BC; Celtiberian from the 2nd century BC; Primitive Irish Ogham inscriptions from the 4th or 5th century AD, earliest inscriptions in Old Welsh from the 7th century AD. Modern Celtic languages include Welsh, Cornish, Breton, Scottish Gaelic, Irish and Manx.
* Germanic (from Proto-Germanic), earliest attestations in runic inscriptions from around the 2nd century AD, earliest coherent texts in Gothic, 4th century AD. Old English manuscript tradition from about the 8th century AD. Includes English, Frisian, German, Dutch, Scots, Danish, Swedish, Norwegian, Afrikaans, Yiddish, Low German, Icelandic, Elfdalian, and Faroese.
* Hellenic (from Proto-Greek, see also History of Greek); fragmentary records in Mycenaean Greek from between 1450 and 1350 BC have been found. Homeric texts date to the 8th century BC.
* Indo-Iranian, attested circa 1400 BC, descended from Proto-Indo-Iranian (dated to the late 3rd millennium BC).
** Indo-Aryan, attested from around 1400 BC in Hittite texts from Anatolia, showing traces of Indo-Aryan words. Epigraphically from the 3rd century BC in the form of Prakrit (Edicts of Ashoka). The Rigveda is assumed to preserve intact records via oral tradition dating from about the mid- second millennium BC in the form of Vedic Sanskrit. Includes a wide range of modern languages from Northern India, Eastern Pakistan and Bangladesh, including Hindustani (Hindi, Urdu