不定詞の形容詞的用法には２種類あり、①限定用法、②叙述用法。②はもちろん主格補語です。

、、。。

There are two types of adjectival use of infinitives: (1) attributive use and (2) predicative use. The latter is of course a subject complement.

Literal

Infinitive [possessive-の] adjectival-use [in-に][topic-は] 2-types exist, (1) restrictive-use, (2) predicative-use. (2) [topic-は] of-course subject-complement [copula-です].

Highly specialized English grammar explanation in Japanese. Technical terms abound: 不定詞 'infinitive,' 形容詞的用法 'adjectival use,' 限定用法 'attributive/restrictive use,' 叙述用法 'predicative use,' 主格補語 'subject complement.' The numbered list format and もちろん 'of course' give it a textbook lecture tone.