There are two declensions in the Laefèvæšii: masculine and feminine. Each declension has different ending and their form depends on number and case.
1.4.1. Masculine declension
Irregularity: the final w in nominative singular changes into vv, stress is replaced on the vowel before vv. (exception is stresses semi-vowel (å) – no changes).
Example: nómiw (nominative singular) – nomívvie (nominative dual) – nomívväs (nominative plural)
Irregularity: when word ends in -j or -y [j], the roof extends:
> with -t-in dative singular and dual
> with -n- in “sub-cases” of dual
> with -v- in “basic cases” of dual and equative dual
Irregularity: when a male name ends in -y [i], the root extends with -nt-.
Example: Áŋsy (nominative) – Áŋsyntau (genitive)
1.4.2. Feminine declension
Irregularity: when a female name ends in -y [j], the roof extends with -a-.
Example: Táy (nominative) – Táyade (genitive)
1.4.3. Endings of partitive case
Partitive case has special endings for numbers from 3 to 19. From 20 the “general ending” is used. When using the “special endings” there is no need for writing the number before a noun; but if it'd written, then the noun gets the “general ending”. The number larger than 20 (including it) have to be written before the noun and the noun gets the “general ending”.
* the final -s in the masculine adjectives (-ymïs) changes into -ž (-ymïža).
For the combination number-adjective-noun and the number is between 3 and 19, there are two ways to write it:
1. number is written before the adjective, adjective is before the noun;
2. adjective and noun get the “general ending” noun gets the “special ending”, adjective goes after the noun and gets the “general ending”
1. eleven big balls → séuşa wárymïžïš a sáhemevïşa
2. eleven big balls → sáhemevïşa wárymïža
But there's also a third way in the above example. The adjective big(wárymï) has also the proclitic form wár- which doesn't change and it's placed before the noun.
> eleven big balls → wár-sáhemevïşa;
> twelve big balls → vrála wár-sáhemëvi