[1] Typical of Masovian dialects, devoicing of word-final consonants before vowels and liquids is present here, including before clitics.
[2] The shift of initial ja-, ra- > je-, re- is present but limited to particular words: jek (jak), remię (ramię).
The shift of medial -ar- to -er- is found only in forms of the verbs trzeć, drzeć, żreć, umrzeć, uprzeć się, zaprzeć, zawrzeć and the nouns tartak, tarcica, umarlak, darń.
Medial ę sometimes lowers, but this is fading, it also sporadically raises to yN, iN, but this is also uncommon.
Final -ę generally denasalizes to -e. Medial ą tends to also decompose to oN, and sometimes then rises to óN, uN.
However, before sonorants, both ę and ą may lose nasality and/or gain j or ł: gęjśor, gołsior (gęsior), cięłżkie (ciężkie), ciełzar (ciężar).
[2][3] Initial i- sometimes takes prothetic j-, but more common are forms without this prothesis.
Initial o- may labialize to ô-, but weakly, and this is often avoided, sometimes leading to hypercorrections: okieć (łokieć).
Initial a- may take a prothetic h- or j-, rarely it may labialize.
The result consonant clusters can then sometimes further reduce: ofiara > ofsiara > osiara, miasto > mniasto > niasto.
The groups chrz, chw sometes change to krz, kw or f: krzan (chrzan), kwasty (chwasty), fytać (chwytać).
The group kt tends to shift to cht: chto (kto), and similarly kł to chł.
Initial ju-, ja-, and je- often shifts to u-, a-, and e-.
Final -ł is often lost in the past tense of verbs whose stems end in a consonant: jad (jadł).
The clusters kć, kp shift to kść, kśp: kśpić (kpić).
śćk is often retained: śćkło (szkło), and śćklep from sklep was formed via analogy to this.
Masculine nouns ending in -a take adjectival declension: organista (nom.
Feminine nouns have ja type stems take -e in the genitive singular: od wiecerze.
Slanted é was retained in the genitive masculine/neuter singular ending of adjectives and pronouns.
Verbs ending in -ąć take -on in the past tense: wzion (wziął), or -en- in other forms: wyjeni (wyjęli).
co is used as a coordinating conjunction instead of że in subordinate sentences and clauses of result, and can also be used instead of który (alongside chtóren and kozden) as a relative pronoun.
o when governing the accusative can mean za or na: zeby go bór o jeden dzień ścion, pamiętajze o me dzieci.