Signs, status labels, and menus in Japan lean on a small set of suffixes that do something English needs a whole clause for: they staple the phase of an action straight onto a noun or a verb stem. 〜中（ちゅう・じゅう）says an action is underway or a span is filled end to end; 〜済み（ずみ）says it is already finished; 〜たて says it was finished a moment ago and is still at peak freshness. Learn these three and you can read half the notices on a Japanese street — and you stop reaching for clunky full sentences where a native speaker snaps one morpheme onto the end of a word.
The deep point to hold onto: each of these is grammar wearing the costume of vocabulary. 会議中 looks like a noun, but it means "is in the middle of a meeting" — a compressed aspectual clause. That compression is exactly why they show up on every shop door and app screen, where there is no room for a sentence.
〜中: an action underway, or a span filled
〜中 attaches to a noun (usually a サ変 action-noun like 会議 or 電話) and marks that the action is currently in progress. Read this sense as ちゅう.
田中は今、外出中です。
tanaka wa ima, gaishutsu-chū desu
Tanaka is out (of the office) right now.
ごめん、今電話中だから、後でかけ直すね。
gomen, ima denwa-chū dakara, ato de kakenaosu ne
Sorry, I'm on the phone right now — I'll call you back.
この道は工事中で、通れません。
kono michi wa kōji-chū de, tōremasen
This road is under construction, so you can't get through.
Notice how tight these are. 電話中 does the work of 今電話をしています ("I am currently making a phone call"). A learner's instinct is to build that full clause; a native speaker reaches for the suffix. Both are correct, but the suffix is what a sign, a chat message, or a status field actually uses.
You will meet this ちゅう sense constantly on shop doors and app screens: 営業中 (open for business), 準備中 (getting ready / not open yet), 使用中 (in use / occupied), 満室 vs 空室... and 只今対応中 (currently being handled).
すみません、まだ準備中ですか。
sumimasen, mada junbi-chū desu ka
Excuse me — are you still not open yet? (asking at a restaurant before opening time)
The other reading: じゅう, "all through / throughout"
Attached to a time span or a spatial extent, 〜中 is read じゅう and means "the whole thing, end to end / all over."
昨日は一日中、家で寝ていた。
kinō wa ichinichi-jū, ie de nete ita
Yesterday I slept at home all day long.
この曲は世界中で流行っている。
kono kyoku wa sekai-jū de hayatte iru
This song is a hit all over the world.
ハワイは一年中、暖かい。
hawai wa ichinen-jū, atatakai
Hawaii is warm all year round.
So there are two jobs, split by reading: ちゅう = in the middle of (an ongoing action); じゅう = throughout (a whole span). The tendency is that action-nouns and bounded events take ちゅう, while time-and-space extents take じゅう.
Do not confuse either suffix use with the ordinary spatial noun 中（なか）, "inside," as in 箱の中 (inside the box). Same kanji, different beast: なか is a location word that takes の; ちゅう/じゅう are bound suffixes that glue directly onto the preceding word.
〜済み: already done, and stamped as such
〜済み comes from the verb 済む（すむ）"to be finished, to be settled." Bolted onto a noun or a verb stem, it marks a state as completed — the linguistic equivalent of a "DONE" stamp. It is the natural language of forms, receipts, and dashboards.
このメールは対応済みです。
kono mēru wa taiō-zumi desu
This email has already been handled.
料金は支払い済みなので、ご心配なく。
ryōkin wa shiharai-zumi na node, go-shinpai naku
The fee's already been paid, so don't worry.
アカウントは登録済みです。あとはログインするだけです。
akaunto wa tōroku-zumi desu. ato wa roguin suru dake desu
The account is already registered. All that's left is to log in.
済み loves to sit before a noun with の, turning into an attributive "already-Xed" label: 確認済みのメール ("an already-checked email"), 予約済みの席 ("a reserved seat"), 使用済みの切符 ("a used ticket").
この書類はもう確認済みだから、そのまま提出していいよ。
kono shorui wa mō kakunin-zumi dakara, sonomama teishutsu shite ii yo
This document's already been checked, so you can just submit it as is.
Why not simply say 確認しました ("I checked it")? Because 〜ました reports the act; 〜済み labels the resulting state as a standing fact, with no doer in view — perfect for a checkbox, a filename, or a shelf sticker. In the tersest written style (spreadsheets, stamps) you will even see the み dropped: 支払済, 確認済.
〜たて: finished a moment ago, still perfect
〜たて (from 〜立て) attaches to a verb's ます-stem (the 連用形) and means "freshly just-done" — the food-and-freshness suffix. It does not merely say "new"; it pinpoints the golden window right after the action finished, and it is almost always appetizing or positive.
朝、取れたての野菜を市場で買ってきた。
asa, toretate no yasai o ichiba de katte kita
This morning I bought some just-picked vegetables at the market.
焼きたてのパンの匂いには、どうしても勝てない。
yakitate no pan no nioi ni wa, dōshite mo katenai
There's just no resisting the smell of fresh-baked bread.
炊きたてのご飯さえあれば、おかずはいらない。
takitate no gohan sae areba, okazu wa iranai
As long as there's freshly cooked rice, I don't need any side dishes.
できたてのうちに食べてね。冷めると味が落ちるから。
dekitate no uchi ni tabete ne. sameru to aji ga ochiru kara
Eat it while it's fresh — it loses flavor once it cools down.
The pattern is productive beyond the kitchen. 塗りたて gives you the classic wet-paint sign, and 生まれたて means "newborn":
「ペンキ塗りたて」って書いてあるよ。触らないで。
penki nuritate tte kaite aru yo. sawaranai de
It says 'wet paint' — don't touch it!
Like 〜済み, たて usually links to a following noun with の (焼きたてのパン) or sits in the frame 〜たてのうち ("while still fresh"). Note it names the moment after completion, which is why 新しいパン ("new/fresh bread," could be from this morning) and 焼きたてのパン ("bread pulled from the oven minutes ago") are not interchangeable — たて is far more specific and far more mouth-watering.
The three at a glance
| Suffix | Attaches to | Aspect it marks | Typical home |
|---|---|---|---|
| 〜中（ちゅう） | action-noun | in progress / underway | signs: 営業中, 会議中, 工事中 |
| 〜中（じゅう） | time / space span | throughout, all over | 一日中, 世界中, 一年中 |
| 〜済み（ずみ） | action-noun / verb stem | completed, standing state | forms, labels: 確認済み, 支払い済み |
| 〜たて | verb ます-stem | just finished, peak-fresh | food & freshness: 焼きたて, できたて |
Common mistakes
1. Building a full clause where the suffix is idiomatic. For "I'm on the phone right now," English speakers assemble 今電話をしています. It is grammatical, but on a chat message or a status line it sounds heavy; the native reflex is 電話中.
❌ 今電話をしていますので、後でかけ直します。
Not wrong, but wordy for a quick message — the compact status form is 電話中.
✅ 今、電話中なので、後でかけ直します。
ima, denwa-chū na node, ato de kakenaoshimasu
I'm on the phone right now, so I'll call you back.
2. Reading 中 as only spatial "inside." Learners meet 箱の中（なか）first and then misread 会議中 as some kind of "inside the meeting," missing that it is the aspect suffix ちゅう.
❌ 部長は会議の中です。
Sounds like 'inside the meeting (room)' — for 'is in a meeting,' drop の and use the suffix: 会議中.
✅ 部長は今、会議中です。
buchō wa ima, kaigi-chū desu
The department head is in a meeting right now.
3. Using 〜ました where a label wants 〜済み. Reporting the act ("I checked it") is fine in speech, but a form field, filename, or sticker wants the standing state.
❌ この項目は確認しましたの状態です。
Ungrammatical mash-up — to label the completed state, use the suffix: 確認済み.
✅ この項目は確認済みです。
kono kōmoku wa kakunin-zumi desu
This item has already been checked.
4. Mixing up the ちゅう/じゅう readings. Saying 一日ちゅう or 会議じゅう marks you instantly. Span → じゅう; ongoing action → ちゅう.
❌ 昨日は一日ちゅう、勉強していた。
Wrong reading — a whole-day span takes じゅう: 一日中（いちにちじゅう）.
✅ 昨日は一日中、勉強していた。
kinō wa ichinichi-jū, benkyō shite ita
Yesterday I studied all day long.
5. Treating たて as a plain "new/fresh." たて is not the adjective 新しい; it names the moment right after the action, so it only fits things that were just made/picked/done.
❌ この焼きたてのシャツを買った。
Nonsensical — shirts aren't 'baked.' たて attaches only to a real just-finished action (焼く, 取る, できる…).
✅ この焼きたてのパンを買った。
kono yakitate no pan o katta
I bought this fresh-baked bread.
Key takeaways
- Each suffix compresses an aspectual clause into one morpheme, which is why signs and menus rely on them.
- 〜中（ちゅう） = an action underway (会議中, 工事中); 〜中（じゅう） = a span filled end to end (一日中, 世界中). The reading is partly lexicalized — learn it per word (午前中 is ちゅう; 今日中 is じゅう).
- 〜済み = a completed, standing state ("already done"); it labels forms and screens (確認済み), often attributive with の.
- 〜たて = "freshly just-done," attached to the ます-stem, pinpointing the peak-fresh moment (焼きたて, できたて) — far more specific than 新しい.
- Don't confuse suffix 中（ちゅう/じゅう）with the location noun 中（なか, "inside") that takes の.
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