Japanese Demo Particle Uses: But, Even, Or Something and Nan Demo

Demo at the start of a sentence: but, even so

The demo you meet first stands at the head of a sentence and pushes back against the sentence before it. Kono mise wa oishii desu. Demo, takai desu. The food here is good. But it is expensive. It began life as sore de mo, literally: even with that being so, and that origin explains its behaviour. It accepts the previous statement and then adds that something else still holds.

It also explains the main restriction. Because demo refers back to a complete statement, it needs a full stop before it. It cannot join two clauses inside one sentence the way English but does; that job belongs to kedo and ga. Scene: two friends are choosing a restaurant on their phones.

Noun plus demo: even a child, kodomo demo wakaru

After a noun, demo picks an extreme example to make a point about everything less extreme. Kodomo demo wakaru, even a child understands, literally: be it a child, they understand. A child is the least likely person to understand, so if the statement holds there, it holds for everyone. The named item is one point on the shelf; the wave of the hand covers the rest.

The example can be extreme in either direction. Sensei demo machigaeru, even teachers make mistakes, picks the person least likely to fail. Ima demo oboete imasu, I remember it even now, picks the time when forgetting would be most natural. Scene: a shop assistant is reassuring a customer who is nervous about a new rice cooker.

How demo is built

Demo attaches to nouns, to nouns that already carry a particle, and to question words. It does not attach to verbs or i-adjectives. The reason is its make-up: the de in demo is the te form of da, the plain form of desu, and da only follows nouns and na-adjectives. Verbs and i-adjectives have te forms of their own, so they build the same meaning as te mo.

When demo lands on a noun that would have taken ga or o, those two particles disappear: ocha o nomu becomes ocha demo nomu. Other particles stay and demo follows them: dare to demo, with anyone; ie kara demo, even from home.

A soft suggestion: ocha demo nomimasen ka

In invitations and suggestions, demo names one option without committing to it. Ocha demo nomimasen ka, literally: won't you drink tea, for example? The speaker's real proposal is to take a break together, and tea is the sample. This is why the listener can reply kōhī ga ii desu ne without having refused anything.

The same demo softens plans and idle wishes: eiga demo miyō ka na, maybe I'll watch a film or something. It needs a suggestion, a request or an intention after it. It does not work for reporting facts: kinō ocha demo nomimashita is odd, because a fact about yesterday has no other options left open. Scene: the end of the working day, and a colleague stops at your desk.

Minimal pairs: what one demo changes

Each pair below differs only in the particle after the noun.

Mo adds an item to a list that already exists. Demo adds an expectation: the item was unlikely, and the statement holds all the same. That is why kodomo demo wakaru doubles as a comment on how simple something is, and why it can sting if you say it about a task the listener found hard.

Beyond the basics: nan demo, itsu demo, dare demo

After a question word there is no single item to point at, so only the wave of the hand remains: whichever one you put here, the statement holds. Nan demo, anything; itsu demo, any time; dare demo, anyone; doko demo, anywhere. They go with positive statements. For nothing, nobody and nowhere, Japanese switches to question word plus mo with a negative verb: nani mo tabemasen.

The full comparison of ka, mo and demo after question words has its own article, so here are only the forms you will need at once. Scene: planning dinner with a friend by message.

Neighbours: te mo, and de plus mo as in Tōkyō de mo

Te mo is demo's closest relative, and the dedicated post on it covers the even if pattern in full. The division of labour is simple: verbs and i-adjectives use te mo, nouns and na-adjectives use de mo. Ame ga futte mo ikimasu and ame demo ikimasu both say you will go, rain or no rain.

The harder neighbour looks identical. In Tōkyō de mo kaemasu, de is the particle for the place of an action and mo means also, giving you can buy it in Tokyo too. There is a test. Remove mo and see whether the sentence survives. Tōkyō de kaemasu is a good sentence, so this de is the place particle doing its usual work. Kodomo de wakaru is not a sentence, so kodomo demo is the single unit meaning even. The same test sorts basu de mo ikemasu, you can also get there by bus, where de marks the means.

With places and means, context decides between also and even. Both readings use exactly the same words.

How demo sounds in conversation

Sentence-opening demo is everyday speech at every politeness level, but it is not the only but and not always the wisest. In a meeting, contradicting a senior colleague with demo can sound like arguing. Speakers soften the turn with sō desu ne first, or use tada, only, or desu ga. In essays, reports and news, shikashi takes over, and demo at the head of a written sentence reads as chatty.

Among friends you will hear demo sa and demo ne as ways to hold the floor while thinking, and datte when the speaker is defending themselves, closer to but I mean. Noun plus demo has no such limits: dare demo and ocha demo are as natural in very polite speech as in family talk.

Common mistakes with demo

Ikitai demo jikan ga nai is wrong. English but sits between two clauses, so learners put demo there. Demo must start a new sentence; inside a sentence use kedo: ikitai kedo, jikan ga nai.

Takai demo kaimasu is wrong. It comes from learning demo as even if and attaching it to everything. I-adjectives and verbs need their own te form: takakute mo kaimasu.

Ocha o demo nomimasen ka is wrong. Learners keep o because the verb needs an object. Demo replaces o and ga, exactly as wa and mo do: ocha demo nomimasen ka.

Nan demo tabemasen, meant as I don't eat anything, is wrong. English anything serves both positive and negative sentences; Japanese splits them. Say nani mo tabemasen, and keep nan demo for nan demo tabemasu, I eat anything.

Kinō tomodachi to kōhī demo nomimashita sounds odd, for the reason given earlier: the soft demo belongs to suggestions and intentions, not to reports of what happened. Say kōhī o nomimashita.