Questions & Answers about O autor é inteligente.
Word by word:
- O = the (masculine, singular definite article)
- autor = author
- é = is (3rd person singular of the verb ser)
- inteligente = intelligent / smart
So the sentence is literally “The author is intelligent.”
In Portuguese, a noun almost always needs an article (or another determiner) in normal sentences.
- O autor é inteligente. = The author is intelligent. (a specific author or one already known from context)
- Um autor é inteligente. = An author is intelligent. (talking about some author, not a specific one)
Leaving the noun without anything (Autor é inteligente) sounds wrong or extremely telegraphic, like a headline or a note on a diagram, not normal speech.