〜だろう: This is how you say you are guessing something. It means 'probably' or 'I think so'. You are not 100% sure.

Dictionary

〜だろう

This is how you say you are guessing something. It means 'probably' or 'I think so'. You are not 100% sure.

N4 KMT4NeutralStandardAuxiliary ConstructionMixedMasculineRough Copula And ConfirmationGrammar

Verb [dictionary form] + だろうPrimary

い-Adjective + だろう

な-Adjective + だろう

Noun + だろう

Verb [た-form] + だろう

This is how you say you are guessing something. It means 'probably' or 'I think so'. You are not 100% sure.

明日の会議は長くなるだろう。

Tomorrow's meeting will probably be long.

FormalNon PastAffirmativeSentence EndingConjecturalWork & Career

犯人はあの男だっただろう。

The culprit was probably that man.

NeutralPastAffirmativeSentence EndingConjecturalPolitics & Law

この方法なら、それほど時間はかからないだろう。

With this method, it probably won't take that much time.

NeutralNon PastNegativeSentence EndingConjecturalWork & Career Technology

お前もパーティーに来るんだろう？早く準備しろよ。

You're coming to the party too, right? Hurry up and get ready.

CasualNon PastAffirmativeSentence EndingEmphaticDaily Life

彼は「これで勝てるだろう」と油断していた。

He was careless, thinking, 'With this, I'll probably win.'

NeutralNon PastAffirmativeMid SentenceConjecturalSports & Martial Arts Emotions & Psychology

How you say "darou" changes its meaning. A downward tone means "probably." An upward tone asks for agreement. This can sound strong, like you are very sure.

だろう is the casual form of でしょう. だろう can be shortened to だろ. だろ sounds more direct. You use it to ask for agreement. For example, 'He will come, right?'

Use this when you ask yourself a question. You are thinking out loud. You are wondering about something. For example, you might say, "I wonder why he did not come."

Contrasts with(2)

〜だろうが

This phrase shows you are very sure about something. You think it is very clear. You might be a little angry or upset that someone does not agree.

〜かも

This means 'maybe' or 'might'. You use it when you are not sure about something.

More formal alternatives(2)

〜だ

This word means 'is' or 'am'. You use it to say what something is. It is a casual way to say it.

〜だろ

You add だろ to the end of a sentence. It shows you are very sure about something. You might also use it to ask for agreement.

Dialect / slang variants(1)

〜だろべ

This phrase means 'it's probably...' or 'I bet it is...' You use it to guess something strongly. You also use it to ask if someone agrees with your guess.

〜だ / 〜だった

This means 'is' or 'was'. It is the casual way to say 〜です and 〜でした.

辞書形

This is the basic form of a verb. It is what you find in a dictionary. You use it to make other verb forms.

〜い / 〜かった

This is the basic form of an い-adjective. It describes a quality of something. You use it for present or past qualities.

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Dictionary

〜だろう

This is how you say you are guessing something. It means 'probably' or 'I think so'. You are not 100% sure.

N4 KMT4NeutralStandardAuxiliary ConstructionMixedMasculineRough Copula And ConfirmationGrammar

Verb [dictionary form] + だろうPrimary

い-Adjective + だろう

な-Adjective + だろう

Noun + だろう

Verb [た-form] + だろう

This is how you say you are guessing something. It means 'probably' or 'I think so'. You are not 100% sure.

明日の会議は長くなるだろう。

Tomorrow's meeting will probably be long.

FormalNon PastAffirmativeSentence EndingConjecturalWork & Career

犯人はあの男だっただろう。

The culprit was probably that man.

NeutralPastAffirmativeSentence EndingConjecturalPolitics & Law

この方法なら、それほど時間はかからないだろう。

With this method, it probably won't take that much time.

NeutralNon PastNegativeSentence EndingConjecturalWork & Career Technology

お前もパーティーに来るんだろう？早く準備しろよ。

You're coming to the party too, right? Hurry up and get ready.

CasualNon PastAffirmativeSentence EndingEmphaticDaily Life

彼は「これで勝てるだろう」と油断していた。

He was careless, thinking, 'With this, I'll probably win.'

NeutralNon PastAffirmativeMid SentenceConjecturalSports & Martial Arts Emotions & Psychology

How you say "darou" changes its meaning. A downward tone means "probably." An upward tone asks for agreement. This can sound strong, like you are very sure.

だろう is the casual form of でしょう. だろう can be shortened to だろ. だろ sounds more direct. You use it to ask for agreement. For example, 'He will come, right?'

Use this when you ask yourself a question. You are thinking out loud. You are wondering about something. For example, you might say, "I wonder why he did not come."

Contrasts with(2)

〜だろうが

This phrase shows you are very sure about something. You think it is very clear. You might be a little angry or upset that someone does not agree.

〜かも

This means 'maybe' or 'might'. You use it when you are not sure about something.

More formal alternatives(2)

〜だ

This word means 'is' or 'am'. You use it to say what something is. It is a casual way to say it.

〜だろ

You add だろ to the end of a sentence. It shows you are very sure about something. You might also use it to ask for agreement.

Dialect / slang variants(1)

〜だろべ

This phrase means 'it's probably...' or 'I bet it is...' You use it to guess something strongly. You also use it to ask if someone agrees with your guess.

〜だ / 〜だった

This means 'is' or 'was'. It is the casual way to say 〜です and 〜でした.

辞書形

This is the basic form of a verb. It is what you find in a dictionary. You use it to make other verb forms.

〜い / 〜かった

This is the basic form of an い-adjective. It describes a quality of something. You use it for present or past qualities.

Track your mastery

Kumi's KMT system tracks your mastery across kanji, vocabulary, grammar, and reading. Create a free account to use it on 220,000+ concepts.

〜だろう

Patterns5

Meaning

Examples5

Nuance1

Contrasts1

Discourse Function1

Compare with5

Contrasts with(2)

More formal alternatives(2)

Dialect / slang variants(1)

Prerequisites3

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〜だろう

Patterns5

Meaning

Examples5

Nuance1

Contrasts1

Discourse Function1

Compare with5

Contrasts with(2)

More formal alternatives(2)

Dialect / slang variants(1)

Prerequisites3

Track your mastery