anonymous out of the blue Is out the head of the PP above? Good question. I'd say yes.
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anonymousout of the blue
Is out the head of the PP above?
Good question. I'd say yes. And then 'of' is another head of a PP which is the complement of "out".
[out [of [the blue] ] ]
There may be alternative analyses. 'out' may be considered a modifier of "of the blue". Have you checked CGEL? What do they say? (If