Every word must have only one
root (
free morpheme), always at the beginning. Eskaleut languages have a relatively small number of roots: in the case of Central Alaskan Yup'ik, around two thousand. Following the root are a number of
postbases, which are
bound morphemes that add to the basic meaning of the root. If the meaning of the postbase is to be expressed alone, a special neutral root (in the case of Central Alaskan Yup'ik and Inuktitut
pi) is used. The basic word schema is as follows: root-(affixes)-inflection-(enclitic). Below is an example from
Central Siberian Yupik. {{interlinear|lang=ess|indent=2 There are a total of three affixes internal to the word . The root (or free morpheme) and the inflection on the right consist of the indicative mood marker plus third person singular. The enclitic ‘also’ follows the inflection. Following the postbases are
non-lexical suffixes that indicate
case on nouns and
person and
mood on verbs. The number of cases varies, with Aleut languages having a greatly reduced case system compared to Eskimoan. The Eskimoan languages are
ergative–absolutive in nouns and in Yup'ik languages, also in verbal person marking. All Eskaleut languages have
obligatory verbal agreement with agent and patient in
transitive clauses, and there are special suffixes used for this purpose in
subordinate clauses, which makes these languages, like most in the North Pacific, highly
complement deranking. At the end of a word there can be one of a small number of
clitics with meanings such as "but" or indicating a
polar question. Phonologically, the Eskaleut languages resemble other language families of northern North America (
Na-Dene and
Tsimshianic) and far-eastern Siberia (
Chukotko-Kamchatkan). There are usually only three vowels—, , —though some Yup'ik dialects also have . All Eskaleut languages lack both
ejectives and
aspirates, in which they resemble the Siberian languages more than the North American ones. Eskaleut languages possess
voiceless plosives at four
positions (
bilabial,
coronal,
velar and
uvular) in all languages except Aleut, which has lost the bilabial stops (though it has retained the
nasal). There are usually contrasting voiced and voiceless
fricatives at the same positions, and in the Eskimoan subfamily a
voiceless alveolar lateral fricative is also present. A rare feature of many dialects of Yup'ik and Aleut is contrasting
voiceless nasals. == Phonology ==