наве́рно vs мо́жет быть

naverno vs mozhet byt — probably vs maybe

What it really means

Наве́рно means “probably” or “most likely.” It presents a fairly strong guess based on evidence or expectation: он, наверное, уже дома suggests that the speaker considers being home likely. In conversation, наверное is often used as an introductory word and is separated by commas.

Мо́жет быть means “maybe” or “it may be,” leaving the possibility more open. It is the fixed phrase of the verb мочь and быть, and it can stand at the beginning or in the middle of a sentence: может быть, завтра. The contrast is one of confidence: наверное leans toward yes, while может быть remains more undecided.

Examples in natural speech

Наве́рно, он уже приехал.
He has probably arrived already.
Она, наве́рно, забыла ключи.
She probably forgot the keys.
Мо́жет быть, мы встретимся завтра.
Maybe we will meet tomorrow.
Он может быть дома.
He may be at home.
Наве́рно, лучше подождать ещё час.
Probably it is better to wait another hour.

Common mistakes

Do not treat наверное and может быть as exact synonyms: наверное normally signals greater likelihood. Keep может быть as two words, and distinguish the introductory phrase Может быть, он придёт (“Maybe he will come”) from он может быть дома (“He may be at home”), where the verb phrase is part of the sentence.

Memory tip

Наве́рно leans toward “yes”; мо́жет быть keeps both answers open.

Frequently asked questions

Where does the comma go with наверное?

As an introductory word, it is normally set off: Наверное, он занят; Он, наверное, занят.

Is может быть always an introductory phrase?

No. It can be a regular verb phrase: Он может быть дома means “He may be at home.”

Which is stronger, наверное or может быть?

Наверное usually expresses the stronger expectation, while может быть is a more open “maybe.”

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