According to B.F.Skinner,what allows children to learn how to construct grammatical sentences

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Skinner believed that language learning is based on reinforcement and shaping, with children imitating adults and receiving feedback on the correctness of their responses. Therefore, imitation and shaping are the processes that allow children to construct grammatical sentences, rather than receiving specific instruction or relying on the LAD. Nonreinforced trial and error, although part of the learning process, is not the primary mechanism for constructing grammatical sentences according to Skinner's theory.