english-sentence.affix

data Number = singular | plural
data Person = 1st | 2nd | 3rd
data Gender = nonbinary | feminine | masculine | neutral

rule start = english_sentence + "."

rule english_sentence
  = pronoun.Number.Person.Gender are.Number.Person.Gender adj
  | subj.N1.G1 verb.N1.G1 obj.N2.G2 
  
rule pronoun.Number.Person.Gender =
  .singular {
    .1st.* -> "I"
    .2nd.* -> "you"
    .3rd {
      .nonbinary -> "they"
      .feminine -> "she"
      .masculine -> "he"
      .neutral -> "it"
    }
  }
  .plural {
    .1st.* -> "we"
    .2nd.masculine -> "you guys" | pronoun.plural.2nd.neutral
    .2nd.* -> "you" | "y'all"
    .3rd.* -> "they"
  }
  
rule are.Number.Person.Gender =
  .singular {
    .1st.* -> "am"
    .2nd.* -> "are"
    .3rd {
      .nonbinary -> "are"
      .* -> "is"
    }
  }
  .plural.*.* -> "are"
  
rule adj
  = "wholesome"
  | "Russian"
  | "tall"
  
rule subj.Number.Gender =
  .Number.Gender -> pronoun.Number.Person.Gender
                  | article.StartSound.Number noun.StartSound.Number

data StartSound = consonant | vowel

rule article.StartSound.Number =
  .consonant.singular -> "the" | "a"
  .vowel.singular -> "the" | "an"
  .*.plural -> "some" | "a few" | "several" | "two"
  
rule noun.StartSound.Number =
  .consonant.singular -> "cat" | "person" | "boat"
  .consonant.plural -> "cats" | "people" | "boats"
  .vowel.singular -> "hour" | "eagle"
  .vowel.plural -> "hours" | "eagles"
  
rule obj.Number.Gender = .N.G -> subj.N.G

rule verb.Number.Person.Gender =
  .singular.*.nonbinary -> verb.plural.3rd.neutral
  .plural.3rd.neutral -> "eats"
                       | "plays"
                       | "sleeps"
  .*.* -> "DOES SOMETHING"