だろうに means (1) surely…, but ~; although… is likely, ~ and (2) should have (regret); might / must have been ~. It is a JLPT N1 Japanese grammar pattern used to express a strong contrast between an expected situation and a less favorable reality, often tinged with regret or irony.
This grammar point often appears in novels, essays, and the reading section of the JLPT N1. If you want to express that something would or should have been different, but wasn’t — or that you regret an outcome — だろうに is a pattern you will definitely encounter.
What does だろうに mean?
Use だろうに in two main situations:
- Contrast with conjecture: “Surely X would be the case, but (in reality) Y.” The speaker assumes X is natural or expected, but the actual situation is different and usually disappointing.
- Regret about the past: “I should have / would have …” Used with a past-tense statement (often a conditional like 〜ば or 〜たら). The speaker laments a missed opportunity or an unfulfilled condition.
Natural translations include:
- “surely … but …,” “although you would think …,” “it should have been that …,” “I wish (I) had …,” “could have …”
The correct nuance depends on whether the speaker is talking about a present/future expectation or about something that already happened.
How to form だろうに
Plain form of verbs, adjectives, and nouns + だろうに
- Verbs: 辞書形 / た形 + だろうに
→ 行く + だろうに = 行くだろうに → 行った + だろうに = 行っただろうに - い-adjectives: い-adj (plain) + だろうに
→ 高い + だろうに = 高いだろうに - な-adjectives: な-adj + だろうに (the な is dropped before だろうに)
→ 静か + だろうに = 静かだろうに - Nouns: Noun + だろうに
→ 彼 + だろうに = 彼だろうに
The past form (Verbた形 + だろうに) is the most common way to express regret. The non-past form often appears in conditional sentences or when stating the speaker’s expectation about the way things “should” be.
When is だろうに used?
Use だろうに in situations like:
- expressing regret or disappointment about a missed opportunity
- pointing out a gap between a logical expectation and reality
- adding an emotional layer to an observation — often wistful, ironic, or pitying
- storytelling and personal reflections, especially in written Japanese
Tone and register:
- slightly formal and literary; common in essays, novels, and heartfelt speech
- the regretful nuance makes it feel personal rather than clinical
だろうに example sentences
After reading each sentence, ask what job だろうに is doing: either contrasting an expected situation with reality, or expressing regret over something that didn’t happen. That makes the pattern easier to internalize than trying to memorize translations.
Nuance of だろうに
The key nuance is emotional disappointment. Unlike neutral contradiction markers, だろうに always adds a layer of feeling — pity, frustration, or wistfulness.
When you say 彼なら出来るだろうに, you are not simply stating “He can do it, but he isn’t.” You are implying that it’s a shame, that things should be different. In the past form (しただろうに), the nuance shifts to “it would have been better if …” and carries a clear sense of regret.
This emotional weight is what makes だろうに appropriate for personal reflections and narratives. It’s less common in dry, factual reports because objectivity tends to strip away the very emotion the speaker wants to convey.
だろうに vs のに
Both だろうに and のに can express “but” or “although,” but they differ in conjecture and emotional depth.
If you replace だろうに with のに in the first sentence, the regretful “should have” nuance vanishes. It becomes a plain report of “you told me earlier, but … no regret implied.” Choose だろうに when you want to convey that things didn’t turn out as they “should” have.
Common mistakes with だろうに
Is だろうに on the JLPT?
Yes. だろうに is JLPT N1 grammar. You can expect it in the reading section — often inside emotionally charged monologues or reflective passages.
What to expect on the test:
- Questions that test whether you recognize the regretful or ironic nuance.
- Passages where a character says 〜ばよかっただろうに and the question asks about their feelings.
- Answer choices that confuse だろうに with はずだ or のに — be ready to pick the one that carries emotional contrast.
Practice questions for だろうに
Learning path for だろうに
To learn だろうに efficiently, start with the past regret form (the most common one), then move to present conjecture, and finally contrast it with similar patterns.
Related grammar to review next
- であれ〜であれ — presents alternative possibilities, much like だろうに sets up an expected scenario.
- だの〜だの — lists examples, which can appear in sentences with contrastive patterns.
- であれ〜であろうと — “even if it is …”, another N1 pattern useful for hypothetical contrasts.
- だに〜しない — an emphatic negative used with similar literary tone; good to study alongside emotionally charged patterns.
Learn だろうに with Hane
If you want to review だろうに together with the related patterns above, Hane helps you practice Japanese in short, focused sessions.
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FAQ about だろうに
What does だろうに (darou ni) mean in Japanese?
だろうに (darou ni) means “(1) surely..., but ~; although... is likely, ~ (2) should have (regret); might / must have been”. It is JLPT N1 grammar. Use だろうに in two main situations:
How do you form だろうに (darou ni)?
Plain form of verbs, adjectives, and nouns + だろうに - Verbs: 辞書形 / た形 + だろうに → 行く + だろうに = 行くだろうに → 行った + だろうに = 行っただろうに - い-adjectives: い-adj (plain) + だろうに → 高い + だろうに = 高いだろうに - な-adjectives: な-adj + だろうに (the な is dropped before だろうに) → 静か + だろうに = 静かだろうに -…
What is the difference between だろうに and のに?
だろうに: surely … but (should have). のに: even though / despite the fact that.
What is an example sentence with だろうに (darou ni)?
彼なら出来るだろうに、なぜやらないんだろう。 — Surely he could do it, but why doesn't he?