Interjections & Fillers: ano〜・eto〜・sou desu ne (the little words that make conversation natural) [JLPT N4]
By Nihongo to Japan · Updated July 3, 2026
Master interjections and fillers to make your Japanese conversation more natural and smooth.
Interjections & Fillers: あっ・へえ・えーと・あのー
Japanese conversation has many interjections (expressing emotion) and fillers: interjections express instant emotion or reaction, like 「あっ (oh! sudden realization), えっ (huh? surprise), へえ (oh, I see / on getting new info), うわ (whoa! surprise)」; fillers are used to buy thinking time and fill conversational gaps, like 「えーと (um…), あのー (well…), そうですね (let me see…)」. E.g. 「あっ!財布を忘れた!」, 「えーと、なんて言えばいいかな…」.
🧠 Core nuance: little words to convey emotion and buy thinking time
The core falls into two types: ① interjections express instant emotional reactions: あっ (a small realization), えっ (surprise, the unexpected), へえ (the “oh, I see” of getting new info), うわ (strong surprise), ふーん (an unenthusiastic “hmm”). ② fillers carry no actual meaning, used to fill gaps, buy thinking time, soften the tone: えーと (thinking…), あのー (a buffer before speaking / getting attention), そうですね (thinking before answering). They make conversation natural, not stiff, a lubricant natives use heavily.
📌 Common Interjections & Fillers
| Word | Type/Nuance | Use |
|---|---|---|
| あっ/あ | interjection (sudden realization) | あっ!忘れた |
| えっ | interjection (surprise, the unexpected) | えっ?本当? |
| へえ | interjection (oh I see, new info) | へえ、そうなんだ |
| えーと | filler (thinking) | えーと、つまり… |
| あのー | filler (buffer before speaking) | あのー、すみません |
💬 Example Sentences
- あっ!財布を家に忘れてきた!(Oh! I left my wallet at home!) — sudden realization
- えっ?彼女が結婚するって?信じられない!(Huh? She's getting married? Unbelievable!) — surprise
- へえ、そうなんですね。全然知りませんでした。(Oh, I see. I had no idea.) — getting new info
- えーと、なんて言えばいいかな…そうですね、少し難しいです。(Um, how should I put it… well, it's a bit difficult.) — filler
- あのー、すみません、ちょっとお聞きしたいんですが。(Um, excuse me, I'd like to ask something.) — buffer before speaking
🔄 Compare: あっ vs えっ vs へえ vs えーと/あのー
| Expression | Nuance | Example |
|---|---|---|
| あっ | “oh!” (a sudden realization) | あっ、雨だ |
| えっ | “huh?” (surprise, the unexpected, didn't catch it) | えっ、本当? |
| へえ | “oh, I see / hmm” (the exclamation of new info) | へえ、すごい |
| えーと/あのー | (fillers) buying thinking time / a buffer before speaking | えーと…/あのー… |
⚠️ Common Mistakes
- Overusing fillers in formal settings: えーと・あのー are fine in moderation, but too many seem un-fluent; restrain them formally.
- へえ vs ふーん: へえ is a genuine “oh, I see” (positive); ふーん is cooler (hmm, unenthusiastic) — different tones.
- Interjection vs filler: interjections express emotion (あっ, えっ); fillers fill gaps (えーと, あのー).
- Not used in writing: these are for speech; not written in prose.
💡 Nuance & When to Use
Interjections and fillers in Japanese conversation are the lubricant that makes dialogue natural: interjections express instant emotion (あっ = realization, えっ = surprise, へえ = oh I see, うわ = whoa); fillers fill gaps and buy thinking time (えーと = thinking, あのー = a buffer before speaking, そうですね = thinking before answering). They make conversation un-stiff, used heavily by natives. Restrain fillers in formal settings; not used in writing. Mastering a few common ones makes conversation far more natural. N4 (conversation).
🎯 JLPT Exam Tips
- N4 conversation: interjections (あっ = realization, えっ = surprise, へえ = oh I see, うわ = whoa); fillers (えーと, あのー, そうですね).
- Categories: interjections express emotion; fillers fill gaps/buy thinking time.
- Distinction: へえ (genuine ‘oh I see') vs ふーん (cooler); interjection vs filler.
🖊️ 練習題(5 題)
Q1. 「___!財布を忘れた!」(啊!忘了錢包!突然發現)
(A) へえ (B) あっ (C) ふーん (D) えーと
Q2. 「___、彼女が結婚するって?信じられない!」(欸!她要結婚了?意外)
(A) ふーん (B) へえ (C) えっ (D) うわ
Q3. 「___、そうなんですね。知りませんでした。」(是這樣啊,我不知道,獲得新資訊)
(A) えーと (B) へえ (C) あのー (D) うわ
Q4. 「フィラー」とは何か?
(A) 強い感嘆を表す感動詞。
(B) 会話の間を埋め、思考時間を稼ぐための語(えーと・あのーなど)。
(C) 男性だけが使う語。
(D) 否定を表す語。
Q5. 「___、なんて言えばいいかな……そうですね、少し難しいです。」(那個,要怎麼說好呢……填充・猶豫)
(A) うわ (B) あのー (C) まじで (D) へえ
答案解析
1. (B) あっ ── 「あっ!財布を忘れた(啊!忘了錢包!)」= 突然的小發現 → あ/あっ(輕度驚訝・突然發現)。
2. (C) えっ ── 「えっ!彼女が結婚するって?(欸?她要結婚?)信じられない(不敢相信)」= 意外・驚訝 → えっ(中高度驚訝・不敢相信)。
3. (B) へえ ── 「へえ、そうなんですね(是這樣啊)。知りませんでした(我不知道)」= 獲得新資訊時的感嘆 → へえ(原來如此・是這樣啊)。
4. (B) ── フィラー = 填充詞,在說話間隙填充以爭取思考時間的詞語(えーと・あのー・そうですね等),不是感嘆,是會話的流暢連接工具。
5. (B) あのー ── 「あのー(那個),なんて言えばいいかな(要怎麼說好呢)……」= 猶豫・填充間隙 → あのー(フィラー,猶豫・開口說話時使用)。