Learn Hardcore Portuguese (Portugal): Eu acho que o melhor é descansar.

Acho is the first-person singular present form of the verb achar, which means “to think” or “to believe.” In this sentence, it expresses the speaker’s opinion: “I think.”

How is o melhor functioning here? Is it just an adjective or does it serve as a noun?

Although melhor is an adjective meaning “better” or “best,” when it appears with the definite article o (“the”), it becomes a nominal expression. In this context, o melhor acts as a noun phrase, effectively meaning “the best thing” or “the best option.”

Why is the infinitive descansar used instead of a conjugated verb form?

The use of the infinitive descansar is common in constructions where an action is described in a general, abstract sense. In the sentence “Eu acho que o melhor é descansar,” the infinitive serves as a subject complement after the linking verb é (“is”). It indicates that “resting” is the ideal or best action, without referring to a specific instance of rest.

Is it necessary to include the subject pronoun eu? What does its inclusion imply?

No, it isn’t strictly necessary because the verb acho already implies the subject “I” through its ending. However, using eu can add clarity, emphasis, or formality—especially for learners—making it explicit that the statement reflects the speaker’s personal opinion.

Can this sentence be rephrased while keeping the same meaning? If so, how?

Yes, it can be rephrased. For example, one might say “Na minha opinião, o melhor é descansar” (In my opinion, the best thing is to rest) to emphasize that it is a personal view, or simply “O melhor é descansar” if the context already makes the speaker’s perspective clear. Both alternatives convey the same idea that resting is the best course of action.