There are two dialects: Tagdal proper, spoken by the Igdalen people, pastoralists who inhabit a region to the east along the Niger border to Tahoua in Niger,[4] and Tabarog, spoken by the Iberogan people of the Azawagh valley on the Niger–Mali border. The Iberogan sometimes refer to their language as Tagdal.[citation needed]
Nicolaï (1981) uses the name Tihishit as a cover term. Rueck & Christiansen say that
...the Igdalen and the Iberogan have for many purposes been treated as one group, and their speech forms are closely related. Nicolaï uses "tihishit" as a common designator for these two speech forms...; however, this term is ambiguous. "Tihishit" is a term of Tamajaq origin meaning "the language of the blacks". The Igdalen and Iberogan used it to refer to all Northern Songhay speech forms.[5]
Each of the vowels /i, e, ə, a, o, u/ tend to fluctuate within the presence of the phonemes /x, ɣ, q, ʕ, ħ/ or of a pharyngealized consonant, as [ɨ, ɛ, ʌ, ɑ, ɔ, o].[7]
Tagdal gets its pronominal system from Northern Songhay languages.
Singular
Plural
1st
ɣɑy
iri
2nd
nin
ɑnji
3rd
ɑnga
ingi
Subject prefixes:
Singular
Plural
1st
ɣɑ-
iri-
2nd
ɘn/ni-
ɑnji-
3rd
ɑ-
i-
Tadgal has two different prefixes used for negation. The first is nɘ-, which functions as perfective negation, and is the default choice for negation. It indicates something that might have happened in the past, but didn't, or in the case of stative verbs, something that is not true. The other negation prefix is sɘ-, which acts as a negation in the present or future. Uses of this negation are shown in these examples:[8]
ɣɑnɘkoy: I did not go
ɣɑsɘbkoy: I was not going/I do not (habitually) go
^This map is based on classification from Glottolog and data from Ethnologue.
^Ritter, Georg (2009). Wörterbuch zur Sprache und Kultur der Twareg II Deutsch-Twareg. Wiesbaden: Harrassowitz. p. 735.
^ abcBenítez-Torres, Carlos M. (2009). "Inflectional vs. Derivational Morphology in Tagdal: A Mixed Language"(PDF). In Masangu Matondo; Fiona Mc Laughlin; Eric Potsdam (eds.). In Selected Proceedings of the 38th Annual Conference on African Linguistics. Somerville: Cascadilla Proceedings Project. pp. 69–83.
^Catherine Taine-Cheikh. Les langues parlées au sud Sahara et au nord Sahel. De l'Atlantique à l'Ennedi (Catalogue de l'exposition « Sahara-Sahel »), Centre Culturel Français d'Abidjan (Ed.) (1989) 155-173
^Benítez-Torres, Carlos M. (2021). A Grammar of Tagdal: a Northern Songhay language. Leiden University. hdl:1887/3240577.