Two kinds of error, only one of which gets fixed
An error that breaks understanding gets repaired immediately, because the conversation cannot continue otherwise. You notice it, the other person notices it, and it gets fixed, which is why learners overestimate how much of their Japanese is being corrected.
An error that merely sounds blunt does not interrupt anything. It is understood perfectly, it produces a small adjustment in the listener that you never see, and correcting it would require them to comment on your manners. So it survives, sometimes for years, and the learner has no way of knowing.
This is why the category is worth learning explicitly rather than waiting for feedback. The feedback is not coming.
Requests that land harder than intended
The most common source is the direct request. Translating an ordinary English request produces a Japanese sentence noticeably stronger than the original, because Japanese places its neutral request register lower.
The fix is a standard escalation: from the bare imperative through kudasai to a question form. Anything that costs the other person effort should be at least at the question level.
| Japanese | Romaji | Meaning |
|---|---|---|
| ちょっと待って。 | Chotto matte. | Wait. (blunt with anyone senior) |
| ちょっと待ってください。 | Chotto matte kudasai. | Please wait. (neutral) |
| 少々お待ちいただけますか。 | Shōshō omachi itadakemasu ka. | Could you wait a moment? (soft) |
| これ、コピーして。 | Kore, kopī shite. | Copy this. (blunt) |
| これ、コピーしてもらえますか。 | Kore, kopī shite moraemasu ka. | Could you copy this? (fine) |
| お手数ですが、お願いできますか。 | Otesū desu ga, onegai dekimasu ka. | Sorry for the trouble, could I ask you? |
The pattern is that a question form is softer than a command form, however polite the command. Asking whether something is possible leaves the other person a way to decline.
Statements that sound like verdicts
Flat assertions of opinion are stronger in Japanese than their English equivalents. Saying that something is wrong, or that you do not like it, without a hedge reads as a pronouncement rather than a contribution, and in a group setting it can end the topic.
The softeners are small and cheap. To omoimasu, kamoshiremasen and a trailing kedo do most of the work, and they do not weaken your position in the way the English translations suggest.
| Blunt | Softened | Why it matters |
|---|---|---|
| 違います | ちょっと違うかもしれません | Flat contradiction |
| 嫌いです | あまり得意じゃないです | Dislike stated baldly |
| できません | 難しいかもしれません | Refusal with no room |
| 違うと思う | そういう見方もありますね | Disagreement in a group |
| だめです | ちょっと難しいですね | Rejecting an idea |
Every softened version still communicates the same thing. Japanese listeners read the hedge as politeness, not as uncertainty, so nothing is lost.
Register slips with people senior to you
Mixing casual forms into a polite conversation is the register error learners make most, usually at the end of a sentence when concentration lapses. It is understood, it is not corrected, and it is noticed.
The commonest slips are dropping desu and masu when tired, using casual sentence endings with someone senior, and addressing people by name without a title. The last of these is the most visible.
- Keep desu and masu with anyone senior, even when tired; this is the first thing to go.
- Use the family name plus san, never the given name, until invited otherwise.
- Avoid casual endings like da yo and jan in polite conversation.
- Do not use anata with someone senior; use their name and title instead.
- Do not mirror casual speech directed at you by someone older; it is not an invitation.
Sounding presumptuous by accident
A separate group of errors makes you sound as though you are claiming a closeness or a standing you do not have. These are subtle, and they come from forms that look neutral in a textbook: stating what someone else thinks or feels, offering unsolicited evaluation, or accepting praise directly.
Japanese marks other people's internal states as inferred rather than known, and skipping that marking sounds presumptuous even though it is grammatically innocent.
| Japanese | Romaji | Meaning |
|---|---|---|
| 田中さんは嬉しいです。 | Tanaka-san wa ureshii desu. | Claims to know his feelings |
| 田中さんは嬉しそうです。 | Tanaka-san wa ureshisō desu. | He seems happy. (correct) |
| 日本語が上手ですね。 | Nihongo ga jōzu desu ne. | Evaluating a senior's ability |
| 勉強になります。 | Benkyō ni narimasu. | I am learning from you. (safe) |
| はい、上手です。 | Hai, jōzu desu. | Accepting praise directly |
| いえいえ、まだまだです。 | Ie ie, mada mada desu. | Not at all, I have a long way to go. |
Finding out what you cannot be told
The structural problem with this whole category is feedback. The people best placed to tell you are the ones for whom telling you would be rude, and they will not, so a learner can repeat a blunt request form for years in complete confidence.
Asking explicitly helps, and asking about a specific sentence helps far more than asking in general. A practice setting where the question costs nothing is what makes this usable, which is a real advantage of working with an AI Sensei in Unihongo's immersive 3D classroom: you can ask whether that sounded rude, in the middle of a conversation, as often as you like.
The session report is useful in the same way, because register slips show up there as corrections even when no human listener would have raised them. That is exactly the class of error this guide is about.
Ask about your five most-used sentences rather than about your Japanese in general. General questions get reassuring answers; specific ones get useful ones.