Kenji's Complete Guide to 'お/ご' Prefixes: Business vs. Everyday Japanese 🎯

When studying Japanese, you've probably wondered: Is this too stiff? Can I really say it like that?

The gap in politeness between business and casual conversation can be huge. At the heart of it sit two tiny prefixes — お (o) and ご (go) — and they can completely shift the nuance of a sentence.

1. The basic rule for お and ご

Hi! I'm Kenji, your Japanese teacher. Today I'll clear up one of the most common stumbling blocks for learners: when to use the お/ご prefixes.

The basic principle:

• お goes on wago (native Japanese, kun'yomi) words.
• ご goes on kango (Sino-Japanese, on'yomi) words.

お名前なまえ (name), ご住所じゅうしょ (address)

💡 Kenji's tip! Add these prefixes when referring to the other person's belongings or actions to elevate politeness.

2. The business / everyday temperature gap

Business contexts run on trust and courtesy, so お and ご are practically required.

Thanking someone for their help or asking for their opinion almost always uses them.

ご協力きょうりょくいただき、誠まことにありがとうございました — Thank you very much for your cooperation.

📌 Context matters! Overusing these in casual chats with friends can sound stiff and distant. Between close friends, dropping them is more natural.

3. Watch the exceptions

Language always has exceptions. Some Sino-Japanese words idiomatically take お rather than ご.

Classic examples: 'telephone' and 'letter'.

お電話でんわ (phone), お手紙てがみ (letter)

⚠️ Heads up! Words like お返事へんじ (reply) — Sino-Japanese roots but written with お — should just be memorised as set phrases.

📌 Kenji's takeaways

お/ご prefixes are a core mechanism for expressing politeness in Japanese. They can feel awkward at first, but with practice they become second nature.