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) ...
MODIFIERS give us information about a noun or pronoun in a sentence. They are important because they help to paint the true picture of the information we seek to convey to our reader or listener. The ...