What is "nominal sentence"

Nominal sentence is a [linguistic]term that refers to a nonverbal sentence (i.e. a sentence without a [finite verb]). As a nominal sentence does not have a verbal predicate, it may contain a nominal predicate, an adjectival predicate, an adverbial predicate or even a prepositional predicate.

The relation of nominal sentences to verbal sentences is a question of tense marking. In most languages with nominal sentences such as Russian, Arabic and Hebrew, the copular verb does not surface in present tense sentences. Conversely, these languages allow the copular verb in non-present sentences. Not true.