Development of Phrase Structure Rules Involved in Tag Questions Elicited from Children
This study demonstrated another way of measuring increasing precision in generating linguistic structure by children who are beyond the age for primary language acquistion. Tag questions were elicited from normal children ranging in age from five to 11 years. Their errors in generating tag questions established that there is a definite hierarchy of difficulty involved in the acquisition of the four linguistic operations which can account for tag question formation. These operations, from most to least difficult, are (1) addition or deletion of negation, (2) auxiliary verb selection, (3) pronoun selection, and (4) inversion of the pronoun and the auxiliary verb. This hierarchy remains constant from five through 11 years of age. Evidence is presented that younger children tend to abstract alternate phrase structure rules which are less complex (relative to the number of operations required) than the rules which can account for spontaneously generated tag questions.