This paper reconsiders Chomsky's Adjunction Condition and suggests some modification of the theory of barriers to solve problems arising mainly from the improper definition of the blocking category and the barrier. It is argued that in S-structure, there is no adjunction in movement except extraposition and topicalization. First, it is suggested that the adjunction conjunction is too powerful in that it allows many ungrammatical sentences. To solve the problems, the assumption was made that there is no adjunction at S-structure except extraposition and topicalization. Next, only inherited barriers were assumed, which is to consider IP, traditionally a defective category, as a normal lexical category. In fact, under the modified barrier theory, subjacency condition can be said to be stronger than it was in Chomsky (1986). In this study, the modified theory was applied to every sentence that had raised problems for barriers and showed that the new definition works well. (JL)

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