GrammarJLPT N5
→ seems
Casual Tag Question / Seeking Agreement / Conjecture
JLPT N5Sentence-ending expressionCasual spoken
だろ is the casual, truncated form of だろう, used predominantly in informal spoken Japanese. It serves three closely related functions: expressing the speaker's conjecture or guess ('I think…', 'It seems…'), seeking confirmation or agreement from the listener ('…right?'), and sometimes asserting something with a tone that expects the listener to agree. The nuance depends heavily on intonation: with rising intonation it functions like a tag question ('right?'), while with falling or flat intonation it sounds more like a personal conjecture or even a slightly pushy assertion. Because だろ is quite casual and can sound masculine or blunt, it is most commonly used among friends, family, or in relaxed settings. Its polite counterpart is でしょう (or the slightly casual でしょ), which serves the same functions but in neutral-to-polite registers. Compared to よね, which gently invites agreement, だろ can carry a stronger sense that the speaker already believes they are correct and is pressing the listener to acknowledge it.
Functions
#1 Seeking confirmation or agreement
Structure
Statement + だろ↑ (rising intonation)
この映画、おもしろかっただろ？
Here だろ is used with rising intonation to ask the listener to confirm something the speaker already believes to be true. The speaker watched the movie and thought it was interesting, and is now checking whether the listener agrees. This tag-question usage is very common in casual conversation and is similar in feel to English 'right?' or 'wasn't it?'. Note that because だろ is quite informal, using it with someone of higher status or a stranger would sound rude.This movie was fun, right?
Structures
- Verb (plain form)
- Verb (plain form) + だろ
- い-Adjective
- い-Adjective + だろ
- な-Adjective
- な-Adjective (stem) + だろ
- Noun
- Noun + だろ
Common mistakes
A common mistake is using だろ in formal or polite situations, where でしょう should be used instead; だろ is casual and can sound blunt or even rude to superiors or strangers. Another frequent error is adding だ before だろ after な-adjectives or nouns, producing incorrect forms like 「きれいだだろ」; the correct form is simply 「きれいだろ」 since だろ itself replaces だ. Similarly, learners sometimes attach だろ after い-adjectives with an unnecessary だ (e.g., 「おいしいだだろ」), when it should be 「おいしいだろ」. Finally, learners may confuse the softer tag-question よね with だろ; while both seek agreement, だろ tends to carry a stronger assumption that the speaker is already right, whereas よね is gentler and more collaborative.
Related
だろうでしょうでしょじゃないかよねんじゃない