Happy is the main lexical predicate here. It takes one argument: an experiencer--John. Tall takes one argument: a theme: Mary. (12) *John is being tall. (13) *Mary is being fond of red roses. (14) ...
The theory of grammar adopted here is that grammar is based on a logical form based on proposition structure. A proposition is that part of a sentence less its modal modifiers--roughly, the node S. A ...
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