Yes, you are. The complement of the verb "be" can be an adjective (like "natural"), but not an adverb (like "naturally"). Note that "natural" is not objective, it's a predicative complement.
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Linian_UWhy can't it be an objective?I don't follow you. What exactly do you mean by 'an objective'?
Linian_UUps....I mean "adjective" - a part of speech (also a word class, a lexical class, or a lexical category)so"is natural" as predicate is a member of sentenceand "natural" as adjective is a part of speech (also a word class, a lexical class, or a lexical category)Yes, "natural" belongs to the category adjective.
BillJIn "it's natural that I lose temper", the predicate (in bold) comprises the verb "be" and an adjective phrase as predicative complement.I learn something new here every day. When I learned this, 'that I lose (my) temper' was called something like "a postposed subject", not part of an adjective phrase. I could be remembering it wrong.
Linian_UWhy? I think we talked of only "natural"Yes, we did, and I'm pleased you understand that the predicate comprises "is natural", where "natural" is an adjective, which is what you were asking about.