InX-bar theory, IP refers to InflectionalPhrase, while CP refers to C________Phrase.
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In modern linguistics, we have a special type of words which are used to introduce complement clauses. In English, such kinds of words as that , for, ifare called c_______.
For the sentence "I doubted if he could understand", In the tree diagram of Merger operation analysis, "-ed" and "could" can occupy the i__________ position in IP.
For the sentence "He admitted that he stole the book", In the tree diagram of Merger operation analysis, the word "______" in this sentence can occupy the complementizer position in CP.
For the sentence "Will they have gone?" , the word _______ is originally in the position of "I" in IP, but was moved to the position "C" in CP, this kind of movement is called head movement.