The copula — saying "is"

The word is given in Lesson 06; the rule is taught in Lesson 11, and Lesson 12 drills it with a deliberately wrong sentence.

The existential also wins the sentence-initial slot over the command rule: a sentence beginning with es is “there is”, never “be”.

The rule

Before a noun, es. Before anything else, nothing.

es is a verb. It appears when the thing after the subject is a noun, and only then.

Why a noun needs it and an adjective does not

Because of the possession rule. Two nouns side by side already mean something: the second owns the first.

Without es, Sol doktor can only be “Sol’s doctor”. With it, “Sol is a doctor”. The two readings never touch.

An adjective cannot own anything, so dom kabir has no possessive reading to collide with. It needs no es, and it takes none.

Tense

es is a verb, so it takes the tense particles like any verb:

Adjectives and place words take the tense particle directly — in a sentence, they do the work of a verb:

There is no suda es kabir. An adjective is its own verb.

Adjective: sentence or phrase?

dom kabir standing alone is a sentence: “the house is big”. Inside a longer sentence it is a phrase: Mi kan dom kabir — “I see a big house”. The difference is whether anything comes before or after it. This is exactly how Indonesian rumah besar works, and it has served three hundred million people without a copula.

In questions

The question word takes the slot of what it asks about, so es stays where it is:

Sources

es is the oldest and most widely shared verb on Earth. Spanish es, Latin est, Italian è, French est, Portuguese é, German ist, English is, Dutch is, Russian est’, Polish jest, Hindi hai, Persian ast, Greek eínai, Sanskrit asti — every one from the same root, spoken today by some three billion people.

The split — a copula with nouns, none with adjectives — is the Chinese rule (wǒ shì yīshēng but fángzi dà), the Swahili rule (mimi ni daktari but adjective agreement), the Haitian rule (mwen se doktè but kay la gwo). Zero copula with adjectives alone is the majority pattern: Russian, Arabic, Hebrew, Turkish, Hungarian, Indonesian, Japanese, Korean, Thai, Vietnamese.

Why this and not the alternatives

Why not zero everywhere. Arabic, Russian and Hebrew manage it, but they have case, agreement or free word order to tell “X is Y” from “X’s Y”. Amadunia has none of those; it has one word order and a possession rule that makes noun noun possessive. Zero copula with nouns was already producing ambiguous sentences in Lessons 6, 7, 9 and 10 — all corrected in this decision.

Why not es everywhere. It would add a word to every adjective sentence the language has spoken since Lesson 3, for no gain: adjectives were not ambiguous when this was decided. And the tense rule for adjectives (dom suda kabir) falls out for free without it. That parenthesis said never until September 5, 2026; the fragment rule of September 3 made it untrue, and the open question below is the correction.

Why es and not another word:

es has no collision and the widest recognition of any candidate by a factor of ten.

Open questions

• Can an adjective stand as a noun? — answered by the rule, not by a decision: no, and the copula is why. An adjective predicate takes no es and a noun predicate must have one, so the moment genc can be a noun, Ta genc stops having one reading. Text 21 had opened seventeen sentences with Genc — the young one — for a day. Every word in them existed, which is why five days of checks for invented words saw nothing; the invention was a shape. The sentences say insan genc, a noun with an adjective after it, which is what the language actually has. Recorded here rather than as an open question because nothing is open: allowing it would cost a settled rule.

• A noun with an adjective is now both a sentence and a phrase. Dom merah is “the house is red” by this rule, and since the fragment rule of September 3, 2026 granted that any constituent may stand alone as an utterance, it is also “the red house” standing on its own. Nothing distinguishes them. 154 two-word utterances in the repository have this shape, counted everywhere but the two pages that state the figure — writing the example Dom merah into this very bullet made the first draft of the count wrong by one, which is the third time this repository’s own prose has become its evidence. check.py recounts it rather than trusting this page.

  The corpus reads only one of them the other way, and it was found by reading Lesson 12 end to end: that lesson’s own table glosses Dom merah. as “The house is red”, and eighty lines later its conversation glossed the identical string “The red house.” The gloss was corrected; the ambiguity was not, because correcting it needs a decision. The two greetings Pagi hao! and Aksam hao! are the other side of it and are not a problem — an idiomatic “Good morning!” for what the words say literally is ordinary translation.

  So this is a formal ambiguity that context has so far carried, exactly like the third option in proposal-names.md. It is recorded, not briefed: it may well need nothing.

  Two scanners for it were written and both rejected. Requiring one string to keep one gloss inside a lesson finds two hits, and both are the deliberate statement-and-question pairs (Yu mau ca. / Yu mau ca?) that teach rising tone — keep the punctuation and it finds nothing, including the Lesson 12 fault, which lives in a conversation’s paragraph translation rather than a table row. Aligning a paragraph translation to the lines above it is guesswork. Neither was added; a check that cannot catch the fault that prompted it is worse than no check, because it reads as cover.

• “want to be” plus an adjective has no form. es is a verb and can be chained — mau es doktor, “want to be a doctor”. An adjective is its own predicate and takes no verb, so mau has nothing to attach to: “wants to be the easiest” cannot be built. Both text 3 and Lesson 21 hit this and both were rewritten around it — text 3 by supplying a noun (mau es lingua paling asan), Lesson 21 by dropping the modal. Whether es is allowed before an adjective inside a verb chain, or something else is needed, is undecided. Found September 3, 2026 by checking every sentence in the repository against the copula rule.

• Verb chaining — settled in verb-chains.md: the verbs simply follow one another, Mi mau kula pan.

• Negation — settled in negation.md: Mi no es doktor. no goes before es, and before the tense particle when there is one.

• Existence — settled September 3, 2026: es at the front of the sentence, with no subject, means “there is”.

  Es hotel in madina.	There is a hotel in the city.
  No es ca.	There is no tea.
  Es dom kabir sini?	Is there a big house here?
  Suda es skola in negara ini.	There was a school in this country.

  No new word. Amadunia never drops a subject, so a sentence beginning with es can only be existential. Spanish hay, French il y a, Portuguese tem, Turkish var and Chinese yǒu all press an existing verb into this job; punya (to have) was the alternative and was rejected because it needs an owner, and existence has none.