〜でしょう (polite) and 〜だろう (casual) express probability or seek confirmation.
Probability - "probably" or "I think"
Seeking agreement - "right?" with rising intonation
Wondering - Often with question words (誰だろう, 何だろう)
It will probably rain tomorrow.
Attaches directly to plain forms. No だ after nouns/な-adjectives.
No だ before でしょう
- ✅ 雨でしょう、静かでしょう
- ❌ 雨だでしょう
だろう is casual — use でしょう in polite speech
Rising vs falling intonation changes meaning
- でしょう↑ = "right?" (seeking confirmation)
- でしょう↓ = "probably" (conjecture)
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