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) ...

With that in mind, you can use this resource to: On the HESI A2, you may be asked to identify which part of a sentence is the subject and which part of a sentence is the predicate. Notice that the ...