The first notion that emerges when the subject concerns the subject predicative is that it is always represented by the adjective, precisely by the definition itself, which is demarcated by the fact that it is justified by the feature which is attributed to the subject through the connecting verb. However, it is noteworthy that some notions should not crystallize over time, as they become subject to change, especially taking into account the prayer context. So, the subject predicative it can also be represented by other part of speech, not just the adjective.
Based on this principle, as we check a little more about what's ahead, we'll start to understand the evident flexibilities, which after being checked, may further expand its competence linguistics. As they are demarcated below, let us observe, making use of examples, of course:
So, let's see what these word classes are, subsidizing ourselves with some examples:
Substantive
The friendship é a reward.
Subjectsubject predicative
Adjective
The girl é lovely.
Subjectsubject predicative
noun pronoun
The knowledge é everything.
Subjectsubject predicative
Infinitive
Love é to live.
Subjectsubject predicative
noun numeral
the studentsthey are two.
Subjectsubject predicative
noun word
The surprise was the dinner.
Subjectsubject predicative
By Vânia Duarte
Graduated in Letters
Source: Brazil School - https://brasilescola.uol.com.br/gramatica/classes-que-atuam-como-predicativo-sujeito.htm