Abstrak 
Morphology
The levels were assumed to be ordered in hierarchy, with phonology at the bottom and semantics at the top. In 1920-1945 American linguists who were many of them structuralim worked hard to find the theory of how sounds are used to distinguish meaning in language. They developed and refined the theory of phoneme (Sapir 1925 and other linguists). Their focus gradually shifted to morphology. In 1940-1960, structuralism was in its high activities. Many linguists investigated the theory of words-structure (Bloomfield, Nida) Later Chomsky and his contemporaries present many kinds of research concerning of the word-structure theories.
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