Lengo or informally known as "Doku" is an Oceanic language spoken on the island of Guadalcanal. It belongs to the Southeast Solomonic language family.

Lengo has 6 vowels.^[2]

Vowel sequences occur commonly for all combinations of these vowels, with the exception of /uo/. The front open-mid vowel /ɛ/ never occurs in sequence.

Lengo has 15 consonants.^[3]

Voiced stops are prenasalized. Two instances of regional variation in these phonemes have been observed. These are /β/ becoming /v/, and /ð/ becoming /z/.

Lengo has five sets of pronominal forms. These are emphatic, subject reference, object, direct possessor, and indirect possessor. These distinguish maximally between four persons (first person inclusive and exclusive, second, and third person), and four numbers (singular, plural, dual, and paucal). There is no grammatical gender distinction, but there is an animacy distinction in the object paradigm. Two further uses of these pronominal forms occur - a reflexive pronoun, and a set of interrogative pronouns.^[4]

The dual and paucal forms are derived from the plural forms by the addition of ko- and tu- respectively. The dual forms are used only to indicate 'two and only two', whilst the plural and paucal forms mean 'two or more' and 'three or more' respectively. First person exclusive excludes the addresse(s).

The emphatic pronoun in Lengo is optional, and can occur in combination with obligatory pronouns that may occur with subject or object function. It can also appear without other pronouns. It is used to emphasize the semantic role of a noun in a clause.^[5]

Examples:

The subject reference pronoun appears as the first element in a verb phrase. It is obligatory in any main clause, but can be excepted in subordinate clauses. It is optional in imperative sentences.^[8]

Example:

The object form in Lengo is identified using a set of pronominal suffixes, which index the object arguments on the verb. In instances where a verb takes both a direct and indirect object, only the indirect object is marked. The third person plural object form is marked for animate or inanimate objects.^[10]

Example:

The direct possessor form is used for inalienably possessed nouns. It is a suffix on the possessed noun that indicates the possessor. In the case of the dual and paucal forms, number is indicated as a prefix on the noun, and the plural form of the possessive suffix is used.^[11]

The third person singular direct possessor appears in two forms, with '-e' being more prevalent than '-na'.^[12]

Examples:

The indirect possessor form is used for alienably possessed nouns. It occurs as a free morpheme preceding the possessed noun. There are two categories distinguished - 'oral consumable' and 'general'. The oral consumable category includes items that are able to be eaten, drunk, or consumed via the mouth, such as tobacco.^[11]

Oral consumable form:

General form:

A reflexive pronoun is composed when a direct possessor suffix is added to the stem 'tibo'. This results in a valency decrease of the verb.^[14]

Examples:

Lengo has two pronouns that have interrogative or relative uses. 'thei' is used if the reference is human, and 'tha' if the reference is non-human.^[16]

Relative use:

Interrogative use:

There are several ways to indicate negation in Lengo.

There is the discontinuous morpheme mua 'NEG', which surrounds the verb being negated. There are three modals which can appear in the serial verb construction and are negative (taigha), prohibitive (tabu) or non-volitive (kou). Lastly, there is the auxiliary boro 'impossible FUT', which is sometimes glossed as 'NEG' and can negate the verb.

The mua... mua 'NEG ... NEG' structure can also be combined with taigha 'NEG' to create a double negative, which carries the meaning of a strong affirmative.^[18]

The grammatical negator, the mua... mua 'NEG ... NEG' structure, is the only instance of a 'discontinuous' morpheme in Lengo. The morpheme mua appears both before and after the verb being negated.^[18] The basic structure of this construction is mua V mua, as seen in (13) and (14):

A variant of this construction is mo ... moa, as seen in (15).

Note that although all examples presented by Unger show mua ... mua 'NEG ... NEG' used for a negative imperative, it should not be assumed that this construction is exclusive to a particular sentence structure. More examples are needed for a satisfactory conclusion.

Regardless, mua ... mua is an uncommon negator in Lengo. Much more frequently used is the modal taigha 'NEG'.

Lengo has a 'serial verb construction'. The various types of serial verb construction identified are directional, sequential, causative, manner, ambient, comitative, dative, instrumental and modal.^[21] The basic structure of a modal serial verb construction is as follows:

V + na V(-O)^[21]

The first verb is the modal verb, and the second verb follows an article (always na). This second verb is treated somewhat like an infinitive.^[22] Lengo has five modal verbs; of these, three are used to create negative constructions. These three are:^[23]

Of all the ways to express negation in Lengo, the modal taigha 'NEG' is the most versatile and often used.^[24] It can be used to negate verbs in statements, like in (16):

In (17) and (18), taigha appears at the very beginning of the serial verb construction, and the realis locative t-i appears between the negator and the article na. The entire serial verb construction is negated by taigha.

Sometimes the construction taigha na undergoes elision and is shortened to tai'na, note that the apostrophe exerted here is not a glottal stop but is merely an indicator to know that the word comes from the two root words taigha and na an example of this is in (19):

It is important to note that this shortened form tai'na 'NEG' should not be confused with tai'na 'LOC'. Refer to example (20), which shows both homophones in use: the first being the locative and the second (bolded) being the combined modal and article.

Taigha is flexible and can be used to create negative polar questions and answer polar questions, as in examples (21), (22) and (23).

Example (21) is a negative polar question which can be answered with either eo 'yes' or taigha 'no'. Answering with eo would mean 'yes, I have not seen your basket', whereas answering with taigha would mean 'no, I have seen it'.^[27]

In example (22), taigha is used to answer a polar question in the negative. In (23), taigha is modified by an adverbial, vata 'yet'.

In (24), o taigha 'or NEG' is added to the end of the sentence to create an alternative question.

A content question can also be answered with taigha, as in (25).

The word tabu 'prohibitive (with consequences); forbidden' is another common way of forming a negative. It is often used by parents who are correcting their children.^[29] As with taigha 'no/none', a clause could consist of the single word Tabu! 'Don't!'^[30] The basic structure is the same as with other modals: the first verb is the modal, and it is followed by the article na and the second verb.

In (26), the consequence of disobeying is explicitly addressed. In (27), the article na is omitted, and the consequence of 'or else ...' is implied.

The third and last negative modal is kou 'refuse', which is used to indicate non-volition. It appears in the same place as taigha and tabu, but carries a more specific meaning.

In example (28), if the more general taigha 'NEG' had been used instead of kou, it would simply mean that the fish do not eat the bait. However, in (28), the fish not only do not eat the bait, but they will not.^[31]

Example (29) has the words laka 'also' and t-i 'REAL-LOC' in between the negator and the article na.

In Lengo, tense auxiliaries appear before the subject reference pronoun and verb. There are two tense auxiliaries: bo 'FUT' and boro 'impossible FUT'. While boro is perhaps not a straightforward example of negation, it nevertheless does carry a meaning of 'negation for a reason'. If tabu is specifically prohibitive and kou is specifically non-volitive, then boro can be presented as a negator denoting impossibility. Furthermore, it is sometimes glossed as NEG, as in (30):

Example (31) shows boro glossed as 'impossible'. However, it still has the effect of negating the verb.

The modal taigha 'NEG can be combined with the mua ... mua 'NEG ... NEG' structure to create a double negative, which carries the meaning of a strong affirmative, as in (32). However, this construction (meaning 'must') is rarely used. Instead, the Pijin form masi 'must', a borrowing from English, is much more common.^[19]

Example (33) shows the same sentence as (32), but without either of the negation structures. This example is a simple imperative.

The following is a list of all the abbreviations used in this article.

• Materials on Karnai are included in the open access Arthur Capell collections (AC1 and AC2) held by Paradisec