Kenji's Japanese Class: Master Intransitive vs. Transitive Verbs (開く vs 開ける)

Hi there, today let me walk you through one of Japanese grammar's trickiest topics — perfectly explained.

💡 Intransitive vs Transitive — What's the difference?

The most fundamental difference comes down to whether there's a doer of the action and an object that receives it. Intransitive verbs (自動詞 jidoushi) describe a change or state that the subject itself undergoes. Transitive verbs (他動詞 tadoushi) describe an action where someone applies force to an object.

🎯 Point 1: Watch the particles!

Intransitive verbs usually take が after the subject (主語しゅご), while transitive verbs take を after the object (目的語もくてきご). Remembering this alone gets you halfway. But in real conversation particles are often dropped, so memorising the verb forms themselves is what really counts.

🔍 'To open' — 開く vs 開ける, a deep dive

Let's use the classic pair 開あく (aku, "to open" intransitive) and 開あける (akeru, "to open" transitive). Picture this: a breeze blows and the window slides open by itself — that's the intransitive 開あく. Now imagine you reach over and open the window to get some air — that's the transitive 開あける.

🚀 The key to intermediate Japanese: expressing 'state'

Going beyond just "open / open", learn how to say "it is (in the state of being) open".