Adjectival sentences (很 + adjective)

In Chinese the adjective IS already the predicate: you do not need 是 ("to be"). But a "bare" adjective sounds incomplete or comparative, so it takes an adverb in front; the most neutral one is 很. That is why 我很好 just means "I’m fine" (here 很 barely means "very"). Negate with 不: 我不忙.