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 .

where's the

there are indirect ways of affecting state laws   by with holding funding's. and that's why we have a 55mph speed on the high way with a design of 70mph speed.