Limited suggestions for improvement within the framework of Esperanto, such as orthographic reforms and riism, are not considered Esperantidos.
Changes from Esperanto include combining the adjective and adverb under the suffix -e, loss of the accusative and adjectival agreement, changes to the verb conjugations, eliminating the diacritics, and bringing the vocabulary closer to Latin, for example with superlative -osim- to replace the Esperanto particle plej "most".
Ido (1907), the foremost of the Esperantidos, sought to bring Esperanto into closer alignment with Western European expectations of an ideal language, based on familiarity with French, English, and Italian.
Reforms included changing the spelling by removing diacritics used in alphabet such as ĉ and re-introducing the k/q orthographic distinction; removing a couple of the more obscure phonemic contrasts (one of which, [x], has been effectively removed from standard Esperanto); ending the infinitives in -r and the plurals in -i like Italian; eliminating adjectival agreement, and removing the need for the accusative case by setting up a fixed default word order; reducing the amount of inherent gender in the vocabulary, providing a masculine suffix and an epicene third-person singular pronoun; replacing the pronouns and correlatives with forms more similar to the Romance languages; adding new roots where Esperanto uses the antonymic prefix mal-; replacing much of Esperanto's other regular derivation with separate roots, which are thought to be easier for Westerners to remember; and replacing much of the Germanic and Slavic vocabulary with Romance forms, such as navo for English-derived ŝipo.
René de Saussure (brother of linguist Ferdinand de Saussure) published numerous Esperantido proposals, starting with a response to Ido later called Antido 1 ("Anti-Ido 1") in 1907, which increasingly diverged from Esperanto before finishing with a more conservative Esperanto II in 1937.
Esperanto II replaced j with y, kv with qu, kz with x, and diacritic letters with j (ĵ and ĝ), w (ŭ), and digraphs sh (ŝ), ch (ĉ); replaced the passive in -iĝ- with -ev-, the indefinite ending -aŭ with adverbial -e, the accusative -on on nouns with -u, and the plural on nouns with -n (so membrun for membrojn "members"); dropped adjectival agreement; broke up the table of concords, changed other small grammatical words such as ey for kaj "and", and treated pronouns more like nouns, so that the plural of li "he" is lin rather than ili "they", and the accusative of ĝi "it" is ju.
Unlike Interlingua, it uses the immediate source forms of words in modern Romance languages, so its spellings resemble Latin in most cases.
[4] It replaces all of Esperanto's non-Romance vocabulary and some of its grammar with Romance constructions, allows a somewhat more irregular orthography, and eliminates some criticized points such as case, adjectival agreement, verbal inflection for tense and mood, and inherent gender, but retains the o, a, e suffixes for parts of speech and an agglutinative morphology.
[14] It adds a schwa to break up consonant clusters, marks the accusative case with a nasal vowel, has inclusive and exclusive pronouns, uses partial reduplication for the plural (tablo "table", tatablo "tables"), and inversion for antonyms (mega "big", gema "little"; donu "give", nodu "receive"; tela "far", leta "near").
Inversion can be seen in: The antonyms are al "he" and la "she" (compare li "s/he"), the ge- (completive) and eg- (inchoative) aspects, fin- "to finish" and nif- "to begin", and graf- "to write" and farg- "to read".
[17] In 1931 Kálmán Kalocsay published a translation[18] of the Funeral Sermon and Prayer, the first Hungarian text (12th century), in which he created fictitious archaic forms as though Esperanto were a Romance language deriving from Vulgar Latin.
Initially he studies the problem of introduced archaism and mentions earlier trials such as André Cherpillod's 1998 translation of a 1743 French treatise on defecation using non-standard spellings with q, w, x, ſ,[19] Ottó Haszpra's translation La Enfermita Reĝedzino with accents and geminated consonants,[20] Lastly, he lays out the grammar of a fictitious ancestor of modern Esperanto.
Patro nia, kiu estas en la ĉielo, sanktigata estu via nomo.
Give us this day our daily bread; And forgive us our debts, as we also have forgiven our debtors; and lead us not into temptation, but deliver us from evil.