lojban tutorial by ai (2026)

Lojban (pronounced roughly "LOZH-bahn") is a constructed logical language designed for maximum clarity, cultural neutrality, and unambiguity. Its grammar draws from predicate logic, allowing precise expression of complex ideas with minimal ambiguity. It was developed from Loglan in the 1980s by the Logical Language Group (LLG) and is spoken by a small but dedicated community today.

Lojban's goals include:

• Unambiguous grammar — Machine-parsable sentences.
• Phonetic spelling — Written exactly as spoken (audio-visual isomorphism).
• Flexibility — Express vagueness or extreme precision as needed.
• Creativity — Easy compounding of words for new concepts.

1. Pronunciation and Orthography

Lojban uses the Latin alphabet without h, q, w. The letters are: a b c d e f g i j k l m n o p r s t u v x y z ' . (Apostrophe and period are letters too.)

Vowels

• a — as in "father" [a/ɑ]
• e — as in "get" [ɛ]
• i — as in "machine" [i]
• o — as in "bold" or "more" (pure [o], not "so")
• u — as in "cool" or "boot" [u]
• y — schwa, as in "about" [ə]

Diphthongs (treated as single syllables): ai (high), au (cow), ei (hey), oi (boy), and others like ia (yacht), ua (wander), etc.

Consonants

Most are like English, with key differences:

• c — "sh" as in "ship" [ʃ]
• j — "zh" as in "measure" [ʒ]
• x — "ch" as in German "Bach" or Scottish "loch" [x]
• ' (apostrophe) — glottal "h" [h]
• . (period) — glottal stop or pause [ʔ], mandatory before vowel-initial words

Stress: Usually on the penultimate syllable (second-to-last) in content words. Names (cmene) have final stress and start/end with a pause (.).

Tips: Pronounce clearly but naturally. Consonant clusters are common (e.g., "mlatu" = cat); insert a slight schwa buffer if needed, but don't stress it. All words are spelled phonetically—no silent letters.

2. Core Grammar Concepts

Lojban sentences are built around bridi (predicates/claims), which relate sumti (arguments/participants) via a selbri (the core relation, often a verb-like word).

• Selbri: The predicate (e.g., "tavla" = talks/speaks to...).
• Sumti: The "noun phrases" filling argument places (x1, x2, etc.).
• Bridi: Full claim, e.g., "mi tavla do" = I speak to you.

Basic word types:

• gismu (root words): 5-letter predicates with defined argument places (e.g., prami = x1 loves x2).
• cmavo: Short grammar words (articles, pronouns, tenses, etc.).
• lujvo: Compound words from gismu.
• cmene: Proper names.

Articles (for turning selbri into sumti):

• lo — "the" (generic/descriptive, e.g., "lo mlatu" = a/the cat, or "the one(s) that is/are cat(s)").
• le — "the" (specific, speaker has in mind).
• Others exist for mass, indefinite, etc.

Structure: Sumti + [cu] + selbri + sumti... (cu is an optional separator).

3. Simple Sentences and Examples

Here are foundational examples:

• mi prami do — I love you.
  (mi = I/me; prami = x1 loves x2; do = you)

• le prenu cu tavla mi — The person speaks to me.
  (prenu = person; tavla = x1 talks to x2)

• lo mlatu cu pinxe lo ladru — A cat drinks (some) milk.
  (mlatu = cat; pinxe = drinks; ladru = milk)

• mi patfu do — I am your father. (patfu = father of)

Observative (no x1 sumti, implies "something/someone"):
melbi — (It/that) is beautiful.

Questions:

• xu for yes/no: xu do prami mi? — Do you love me?
• ma for "what?": do prami ma? — You love what/whom?

Negation: na before selbri (simple negation). naku for outer negation.

Commands: ko (imperative you): ko tavla mi — Speak to me! (Talk to me!)

4. Pronouns and Basic Sumti

• mi — I/me
• do — you
• mi'o — you and I (inclusive we)
• mi'a — we (exclusive)
• ti/ta/tu — this/that/that yonder
• ra — he/she/it/they (anaphoric)
• zo'e — unspecified/ obvious (default filler)

Numbers: pa (1), re (2), ci (3), etc. Use li for mathematical expressions.

5. Building Vocabulary

• Learn gismu via dictionaries like jbovlaste or la sutysisku. Many are based on major world languages for international feel.
• Tanru (metaphorical compounds): pelxu mlatu = yellow cat (first word modifies second).
• lujvo: Combine with rules (e.g., veljvo for place structure).

Attitudinals (spoken emoticons): ui (happiness), ue (surprise), ba'u (exaggeration), etc. Place them anywhere to convey emotion.

Tenses: Optional! pu (past), ca (present), ba (future). E.g., mi pu klama — I went (came).

6. More Advanced Topics

• Connectives: .e (and, for sumti), .a (or), .o (if and only if), etc. Many logical variants.
• Relative clauses: poi (which/that): le prenu poi tavla mi — the person who speaks to me.
• Abstractions: nu (event), ka (property), du'u (proposition).
• Conversion: se swaps x1/x2: se prami = is loved by...
• Vocatives: coi (hello!), co'o (goodbye!).

Lojban allows massive flexibility in word order with fa/fe/fi/fo/fu (tag sumti places) or prepositions like be.

7. Practice Tips

• Start with pronunciation drills.
• Build simple sentences, then add complexity.
• Use tools like camxes (grammar checker) or jboski.
• Practice in community chats (Discord, IRC #lojban, etc.).
• Vocabulary: Use Anki/Memrise decks or contextual reading.

Example Dialogue:

• A: coi. do mo? (Hello. How are you?/What are you doing?)
• B: ui. mi gleki. (Happy. I am happy.)

Resources for Further Learning

• Official/Classic: The Complete Lojban Language (CLL) — full reference.
• Beginner Courses: Lojban Wave Lessons, lojban.io courses, "Learn Lojban" on lojban.pw.
• Dictionaries: jbovlaste.lojban.org, la sutysisku.
• Community: lojban.org, Discord/Telegram groups, beginners mailing list.
• Practice: Translate simple English sentences; read Lojban texts with hover glosses.

Lojban rewards persistence—its logical nature makes grammar intuitive once basics click, but building vocabulary and fluency takes time. Start small, speak/write daily, and join the community. .i mi gleki do cilre la lojban — I am happy that you are learning Lojban!

For audio practice, search for Lojban pronunciation guides or recordings on the official sites. Happy learning!