たぶん (Adverb: Probably / Perhaps)

Core / Moderate Probability & Guesses

👀 Layer A: Visual Guide

📝 Quick Summary

たぶん (tabun) is an adverb used to express moderate probability or an educated guess (“probably”, “perhaps”, “likely”). It indicates around 50–70% certainty and frequently pairs with speculative endings like 〜でしょう, 〜とおもいます, or 〜かもしれません.

Structure: たぶん + [Sentence Clause]
Example 1: あしたは たぶん あめがふるでしょう (It will probably rain tomorrow).
Example 2: かれは たぶん きませんとおもいます (I think he probably won’t come).

🔗 Connected Grammar:

🔍 Layer B: Deepening

💡 Raya’s Hack

TABUN vs. KITTO: The Reassurance Trap!
Pay close attention to the difference between these two adverbs:

– たぶん (tabun): ~50-70% certainty (Probably / Perhaps — neutral guess).
– きっと (kitto): ~90%+ certainty (Surely / I’m certain — strong conviction).

If a friend is nervous before an exam, saying “Tabun daijoubu desu” sounds doubtful (“You’ll probably be okay, I guess…”). Always use きっと (kitto) to express firm support and encouragement!