Old Sylvan syllables are structured in the pattern [C][Liquid]V[C]: A vowel, optionally followed by a consonant, optionally preceded by a consonant or a consonant and liquid (r, l, lh, rr, or y). If the syllable begins in a palatized consonant (mj or nj), it may not also include a liquid before the vowel. The syllable may only begin with a stop and a liquid if the liquid is 'l' or 'y'.
The terminal phoneme of a noun is determined by the noun's gender: animate, inanimate, or incorporeal/theoretical. Animate nouns end in a fricative (f, th, s, x, sh). Inanimate nouns end in a non-'y' liquid (r, l, lh, rr). Incorporeal/theoretical nouns end in a stop (p, k, t, ṗ, ḱ, ṫ).
All verbs end in a vowel.
Two identical vowels may never be adjacent.
Sentences are generally constructed in the pattern subject-direct object-indirect object-verb.
Modifiers to a noun generally precede it. However, progressive verbs modifying the noun follow it.
Modifiers to a verb follow it.