Casuma is a fusional nominative-accusative SVO language. It is spoken by approximately 90 million people in Casum and approximately 1 million in surrounding areas. It is an isolate within the Germanic language family. Notable features the retention of Proto-Germanic nasal vowels and the extremely conservative Germanic vocabulary. There are many loans in Casuma from Basque and the Celtic languages. Morphologically, Casuma has four noun cases and two grammatical numbers (three in the pronouns). In addition, verbs conjugate for person and number, three tenses, three moods, and two voices. The three grammatical genders were only preserved in the pronouns.
the Nominative case is the unmodified form of a noun and denotes the subject.
the Accusative case marks the direct object
the Dative case marks the indirect object
the Genetive case shows posession
Nouns follow five different declension patterns depending on the ending of a noun: a noun can decline differently if it ends in a nasal consonant, a consonant other than a nasal, a front or near-front vowel, a central or back vowel, and a nasal vowel.
In the nominative plural, the accusative, and the genetive singular, the nasal vowel will be replaced by it's non-nasal counterpart and then the bolded case ending will be added on. In the genetive plural -es will be infixed between the final consonant and the nasal vowel. In the dative case, the truncations will be the same no matter which nasal vowel the noun ends in.
Adjectives in Casuma preceed the noun they modify and agree with it's case. There are two irregular adjectives (much) and (good). All other adjectives are regular and follow the same declension pattern depending on whether they end in a consonant, vowel, or nasal vowel.
example declension of shaun - "beautiful"
Nasal vowels retain their unnasalized variant in all declensions but the nominative-accusative comparative.
The Casuma verb is fairly simple compared to other germanic languages. 11 strong verbs survive from Proto-Germanic and there are only 2 irregular verbs. Verbs conjugate for 3 moods (indicative, subjunctive, and imperative) and three tenses. The present and past tense are indicated by inflection of the verb, and the future tense is indicated by an auxillary verb. Dual-number pronouns take the plural conjugation.
There are few strong verbs surviving in Casuma, and they take a different conjugation than weak verbs. These are zäwan (to see), helpan (to help), näman (to take), ghäban (to give), ätan (to eat), shäcan (to happen), näwsan (to use), and .