Alterations in certain grammatical features are visible in some of the groupings but are not visible in others. Features demonstrating definite development are incremental use of the past tense (increases from 14% to 23%) and declension of nouns which changes to the effect that the ratio of the accusative case increases from 35% at the age of three to 40% at the age of five, the ratio of the nominative case decreases correspondingly.
Breytingar innan tiltekinna málfræ " iatri " a eru s% nilegar í sumum flokkum en ö " rum ekki, #au atri " i sem s% na ákve " na #róun eru stigvaxandi notkun #átí " ar (fer úr 14% í 23%) og fallbeyging nafnor " a sem breytist á #á lei " a " hlutfall #olfalls eykst úr 35% vi " #riggja ára aldur í 40% vi " fimm ára aldur og hlutfall nefnifalls lækkar a " sama skapi.