The comprehension ability of 36 children at three stages of telegraphic speech was assessed using active behavioral responses to declarative and imperative sentences. A significant increase in verbal and behavioral appropriateness with age was found for imperative and declarative forms. Results are compared with Shipley, Smith and Gleitman's…

In order to investigate the development of word-formation abilities, 3-, 5-, and 7-year-olds were asked to act out with toys, judge, and make up sentences containing instances of class extension. Some sample sentences are "Can you upside-down the clown?" and "Broom the spoon." Children dealt with such sentences in much the same…