inversion :
the process of transformation that moves the auxiliary from the Infl position to a position to the left of the subject, is called inversion.
Such type of inversion operation involving the movement of a word from the head position in one phrase into the head position in another is known as head movement.
transformation :
a special type of rule that can move an element from one position to another.
The yes-no question structures are built in two steps :
1 The usual XP rule is used to form a structure in which the auxiliary occupies its normal position in Infl, between subject and the VP.
2 In forming a yes-no question requires a transformation known as inversion to move theauxiliary from the Infl position to a position to the left of the subject, C position.
追问Thank you~but i wondered what occasions should the inversion occur?Why the transformation is needed?
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