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Explain the notion of the head of a phrase by analyzing the internal elements of NP, VP, AP, ADVP, and PP. What does it mean by saying that each phrase category must contain a head, which is the name of a lexical category, and every other element of the phrase category is optional, but the head is always obligatory? provide examples to make your explanation clear.
Q2: Explain the structural distinction between a complement and an adjunct with at least four different XPs to show the hierarchical internal structure of each by drawing a structural tree for each. Your examples may contain a complement and adjuncts.