The three formulae that children use to express their ideas include actor + action, action + object, and possessor + possession.

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This is true. Research has shown that children typically use these three formulae to express their ideas in the early stages of language development. The actor + action formula involves describing what someone or something is doing, such as "The dog is barking." The action + object formula involves describing what is happening to an object, such as "The ball is rolling." The possessor + possession formula involves describing who owns or has something, such as "That's Mommy's phone."

The Three Formulae That Children Use to Express Their Ideas