, the boy who can run fast jump high? c. *Can the boy that run fast can jump high? d. *Can the bird that swim can fly? e. *Can babies who crawl can walk?

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, ADJ?] such as (11a-b) below. 21 Leaving aside some details, ARP found about the same rate of SD errors in their second experiment, i.e. about 5% of all questions or 7% of all valid responses, with again more than a quarter of the subjects making at least one such error (id, ARP afterwards carried out a second experiment with 33 younger children, pp.254-55

R. , While the results of ARP's experiments seem to demonstrate that children occasionally make SD errors, it might probably be argued that they do not clearly falsify the hypothesis that children acquire something like the SAI operation. However, there is much stronger evidence against SAI. It has been repeatedly observed that many children go through a stage during which they produce both well-formed and ill-formed questions, whether closed or open (cf, 1990.

, Four questions from each type, thus sixteen in all, were elicited from each subject, yielding a total of 528 responses

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