As children move beyond two-word utterances, they begin using plural and possessive nouns, appropriate verb endings, prepositions, articles, and various forms of the verb âto be.â this is evidence that children:

know morphological rules.

Explanation:

Morphological rules -

Morphology simply refers to the study of words , formation of words and the link between the words , is referred to as Morphology.  

Morphological rules consists of the rules , which are responsible to make a proper word and sentence.  

As the child grows , he tries to adapt to the morphological rules in order to learn new words and make sentences .  

Hence, from the given scenario of the question,  

The correct term is Morphological rules .

ya i know i wanna was a good night i wanna was a good night i love y’all bye is your address again call tomorrow morning i love ya bye hi hi i’m going crazy about going to the school and i don’t know if y’all want me or not going tomorrow and i’ll tell you what i’m doing and i’ll y’all with this i’m gonna was a really bad thing to say i don’t think i can but i’ll give ya my friend tomorrow night i love you and y’all so i don’t have a lot to say about you haha is this what time you should be home and i’ll give ya my number so i’m sorry i’ll call y’all bye love ya hey

my good sir, your answer here is "jvhrwekjhvbebebjb"

your welcome.