code$ swipl -s code_English.prolog 

% Janus 1.5.2 embeds Python 3.13.13 (main, Apr  8 2026, 18:23:14) [Clang 21.0.0 (clang-2100.0.123.102)]

Manual & tutorial: https://sandiway.arizona.edu Sandiway Fong (2024-2026)

Run: ?- parse(List,SO,L). (; for more answers)

  List = [..words] (input), SO,L = syntactic object, [..] spellout (output)

See derivation: ?- report. ?- graph. (<- after parse/3) ?- summary. (short) 

  for a long report ?- retract(no_fill).

LEX expansion: ⒜ WordNet: ?- useMorphy. (noMorphy) 

  assert/retract/?- : use_morphy(C), for C={v,n,a,r}. ⒝ edit lex.prolog

  ⒞ ?- addNoun(Word) (addTr/addUrg/addUnacc/addAdj/addPrep).

Welcome to SWI-Prolog (threaded, 64 bits, version 10.0.2)

SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software.

Please run ?- license. for legal details.

For online help and background, visit https://www.swi-prolog.org

For built-in help, use ?- help(Topic). or ?- apropos(Word).

% Interactive session; added `.` to Python `sys.path`

101 ?- parse([there,is,arriving,a,train],S,L).

Words: there is arriving a train 

Initial WS: train_a  arrive_θ:presp  v_arrive  v_v:prog:pres  INFL_v:3sg  

INT/EXT: {C, {INFL_v:3sg, {v_v:prog:pres, {v_arrive, {arrive_θ:presp, train_a}}}}}

EXT: a train 3sg pres be ing arrive 

Spellout: a train is arriving 

Blocked: inconsistent with input!

EXT: there 3sg pres be ing arrive a train 

Spellout: there is arriving a train 

Parse found! 

S = {C, {INFL_v:3sg, {v_v:prog:pres, {v_arrive, {arrive_θ:presp, train_a}}}}},

L = [there,is,arriving,a,train] ;

INT/EXT: {C_Q_aux(3sg,pres,be), {INFL_v:3sg, {v_v:prog:pres, {v_arrive, {arrive_θ:presp, train_a}}}}}

EXT: 3sg pres be →→ a train 3sg pres be ing arrive 

Spellout: 3sg pres be a train ing arrive 

Spellout: is a train arriving 

Blocked: inconsistent with input!

EXT: 3sg pres be →→ there 3sg pres be ing arrive a train 

Spellout: 3sg pres be there ing arrive a train 

Spellout: is there arriving a train 

Blocked: inconsistent with input!

false.

103 ?- report.

REPORT LENGTH: 26

true.

104 ?-