In English, the polite thing to do while someone is talking is to stay quiet and let them finish. In Japanese, the polite thing to do is the opposite: you make a steady stream of little noises — 相槌（あいづち）, "backchannels" — every few seconds, nodding along, to prove the channel is open and you are still with them. Go silent the way an English speaker naturally would, and a Japanese speaker will read it as coldness, boredom, or quiet disagreement, and may even stop to check whether you're still there. Sounding native isn't only about the grammar of speaking; it's just as much about the rhythm of listening. This page gives you the core kit.
The key idea: these are not attempts to take the floor
Before the phrases, the single insight that changes how you use them. In English, jumping in with a sound ("yeah?", "right!") can be a bid to grab the turn. Japanese 相槌 are the reverse: they are cooperative co-construction signals, not turn-taking bids. When you say そうですね while someone explains something, you are not saying "now I want to talk" — you are saying "keep going, I'm following, I'm with you." The speaker keeps the floor; your job is to keep feeding tiny green lights so they know to continue.
The continuation signals: うん / ええ / はい
The most frequent 相槌 are the bare "yes"-family sounds, dropped in at every clause break to mean "mm-hm, go on." They split cleanly by register: casual うん, polite-neutral ええ, and formal はい.
うん、うん、それで？
un, un, sore de?
Mm-hm, mm-hm — and then? (urging a friend to keep telling the story)
ええ、ええ、よく分かります。
ē, ē, yoku wakarimasu
Yes, yes, I completely understand. (attentively following a colleague)
These matter most on the phone, where the speaker can't see you nod. Japanese phone calls are carpeted with はい…ええ…はい every couple of seconds; drop them and the other person will break off to ask if you're still there:
もしもし？聞こえてる？
moshi moshi? kikoeteru?
Hello? Are you still there? (asked when the listener has gone silent too long)
The "I see / that's true" family: そうですね, なるほど, 確かに
Once you're following and agreeing, you upgrade to the understanding signals.
そうですね (polite) / そうなんだ (casual) — "I see / is that so / that's right." The workhorse. Note it does double duty as a thinking-pause too ("well, let me see…"), so context tells you which.
そうなんだ、それは大変だったね。
sō nanda, sore wa taihen datta ne
Oh wow — that must have been rough. (showing sympathy as a friend vents)
なるほど — "ah, I see / that makes sense," said when a piece clicks into place. It signals genuine comprehension of an explanation.
なるほど、そうなんですね。
naruhodo, sō nan desu ne
Ah, I see — so that's how it works. (following someone's explanation)
確かに — "true / indeed / you've got a point," conceding that what they said is right.
確かに、それは一理ありますね。
tashika ni, sore wa ichiri arimasu ne
True — there's definitely something to that.
おっしゃる通りです。すぐに対応いたします。
ossharu tōri desu. sugu ni taiō itashimasu
You're absolutely right — I'll take care of it right away. (deferential, to a superior)
The surprise family: へえ, ほんとう？, まさか, うそ, マジで
When the news is unexpected, you reach for the surprise 相槌, graded by intensity and register.
へえ — mild, genuine "huh! / oh really!" Interest at a fresh fact.
へえ、知らなかった。
hē, shiranakatta
Huh, I had no idea.
ほんとう（に）？／本当ですか — "really?", checking something surprising is true.
まさか — "no way / you can't be serious," for something you almost can't believe.
まさか、本当に？
masaka, hontō ni?
No way — seriously?!
The casual/slang end runs hotter: うそ（"you're kidding" — literally "lie," but not an accusation) and マジで（"for real?"), both very informal.
うそ、信じられない。
uso, shinjirarenai
No way — I can't believe it! (casual)
マジで？それ、やばいじゃん。
maji de? sore, yabai jan
For real? That's insane. (casual, among friends)
And そうそう is the "yes-yes-exactly" of enthusiastic agreement, often when someone voices a thought you shared:
そうそう、それが言いたかったの。
sō sō, sore ga iitakatta no
Yes, exactly — that's just what I wanted to say!
Quick reference by function and register
| Function | Casual | Polite / Formal |
|---|---|---|
| Continue ("go on") | うん | ええ / はい |
| Understand ("I see") | そうなんだ / なるほど | そうなんですね / なるほど |
| Agree ("true") | 確かに / だよね / そうそう | 確かに / おっしゃる通りです |
| Surprise | へえ / うそ / マジで | え、そうなんですか / 本当ですか |
| Prompt more | で？ / それで？ | それで、どうなったんですか |
The ね you keep hearing on these — そうですね, ですよね — is the shared-ground confirmation particle ね: it invites the speaker to feel you're on the same page, which is exactly a backchannel's job. Notice 相槌 almost never take the assertive よ — you're not pushing new information at the speaker, you're aligning with theirs. This whole family lives alongside the other social-glue set phrases like お疲れさま.
Common mistakes
1. Grabbing the floor when a backchannel was wanted. At a mid-story pause, English speakers often launch their own full comment — which yanks the turn away. The 相槌 slot only wants a quick "go on," not a counter-story.
❌ そうですね。実は私も先週、似たようなことがあって…
At a pause mid-story, launching into your own account seizes the floor — a backchannel should hand it back, not take it.
✅ そうなんですね。それで、どうなったんですか？
sō nan desu ne. sore de, dō natta n desu ka?
Oh, I see — so what happened next? (backchanneling and returning the floor to the speaker)
2. Machine-gun はい. Firing はい, はい, はい at a superior sounds military and even impatient. Vary it — ええ, なるほど, そうですね — and let the rhythm breathe.
❌ はい。はい。はい。はい。
Rapid-fire はい sounds curt and soldier-like; mix in ええ / そうですね / なるほど to sound attentive rather than clipped.
✅ はい。ええ、なるほど。そうなんですね。
hai. ē, naruhodo. sō nan desu ne
Yes. Ah, I see. So that's how it is. (a natural, varied rhythm)
3. なるほど upward. As above — to a client or boss it can sound like you're grading them. Climb to おっしゃる通りです or plain そうですね.
❌ なるほど、なるほど。
Aimed upward at the company president, repeated なるほど can read as presumptuous, as if grading their point — use おっしゃる通りです or そうですね upward.
✅ おっしゃる通りです。勉強になります。
ossharu tōri desu. benkyō ni narimasu
You're quite right — that's very instructive. (deferential)
4. Using a dismissive backchannel by accident. ふーん ("hmph, whatever") and a flat へえ can sound bored or unimpressed. If you are interested, add warmth — へえ、そうなんだ！ — rather than a lone, flat ふーん.
❌ ふーん。
A flat ふーん often reads as 'meh, don't care' — dismissive to the speaker.
✅ へえ、そうなんだ！それでどうなったの？
hē, sō nanda! sore de dō natta no?
Oh, really?! So what happened next? (engaged and warm)
Key takeaways
- 相槌 are cooperative "keep going" signals, not bids to take the floor — that's why they come so frequently.
- Continue: うん (casual) / ええ / はい (formal); essential on the phone, where nods are invisible.
- Understand / agree: そうですね, そうなんだ, なるほど, 確かに, おっしゃる通りです.
- Surprise: へえ, ほんとう？, まさか (polite-ish) → うそ, マジで (casual/slang).
- Silence reads as coldness, machine-gun はい sounds military, and なるほど aimed upward can sound presumptuous — vary your backchannels and match the register.
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