The last fluent speaker of Martuthunira, Algy Paterson, died on 6 August, 1995. From 1980 he worked with the linguist Alan Dench to preserve Martuthunira in writing, and it is from their work that most of our knowledge of Martuthunira today comes.
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| Peripheral | Laminal | Apical | ||||
|---|---|---|---|---|---|---|
| Bilabial | Velar | Palatal | Dental | Alveolar | Retroflex | |
| Stop | p | k | c | t̪ | t | ʈ |
| Nasal | m | ŋ | ɲ | n̪ | n | ɳ |
| Lateral | ʎ | l̪ | l | ɭ | ||
| Rhotic | r | ɻ | ||||
| Semivowel | w | j | ||||
Between vowels, the dental stop /t̪/ can become [d̪], [ð], [ð̞], [ɻ], [j], [w], or even simply a syllable break. In some words one particular realization is always used, in others there is free variation.
The alveolar stop /t/ has a voiced allophone [d] after a nasal. It occurs between vowels only in a handful of words, probably all loanwords, where it has a longer period of closure than the other stops [tː].
The retroflex stop /ʈ/ has a voiced allophone [ɖ] after a nasal, and a flapped allophone [ɽ] between vowels.
Besides the voiced allophones mentioned above, stops are usually voiceless and unaspirated.
The laterals have pre-stopped allophones when they occur in a syllable coda.
The alveolar rhotic /r/ is a tap [ɾ] between vowels, and a usually voiceless trill [r̥] finally.
The palatal semivowel /j/ may be dropped initially before /i/, but the equivalent dropping of /w/ before initial /u/ is rare.
| Front | Back | |
|---|---|---|
| High | ||
| Low | ||
/iː/ is realized as [ɪː] in morpheme-initial syllables, [eː] elsewhere.
/u/ is usually realized as [u] in stressed syllables, and [ʊ] in unstressed syllables. /u/ is fronted to varying degrees when near laminal consonants, being most fronted [ʉ] when preceded by a dental consonant. It has an unrounded allophone [ɨ] when followed by /ɻ/.
/uː/ is usually [ʊː], but is lowered to [ɔː] when preceded by a dental consonant.
/a/ is usually [ɐ] when stressed, [ə] when unstressed. Following a laminal consonant, more so after dentals than palatals, it is fronted towards [ɛ]. When preceded by /w/ and followed by a velar consonant, it is realized as [ɒ].
/aː/ is usually simply [ɐː].
Unlike most Australian languages, which exhibit ergativity, Martuthunira and the other Ngayarta languages have an accusative alignment. That is, the subjects of transitive verbs are treated the same as the subjects of intransitive verbs, while the objects are treated differently.
The Martuthunira nominative case is unmarked (zero). The accusative case, which descends from a suffix that originally marked the dative case, takes the form /-ŋu/ on proper nominals; /-ku/ on common nominals ending in a nasal (); /-ju/ on common nominals ending in a lateral or a rhotic (); and vowel lengthening for common nominals ending in vowels. The accusative case is identical to the genitive case, except for common nominals ending in vowels, where the genitive suffix is /-wu/.
| Ngayu | nhawulha | ngurnu | tharnta-a | mirtily-marta-a | thara-ngka-marta-a. | |
| I | saw | that | euro-ACC | joey-PROP-ACC | pouch-LOC-PROP-ACC | |
| I saw that euro with a joey in its pouch. | ||||||