-replace(true);

//Finite forms
#a POS VBZ & #a TOKEN %a ==> #a MORPH #b & #b FIN '+' & #b TENSE 'pres' & #b HEAD %a.
#a POS VBP & #a TOKEN %a ==> #a MORPH #b & #b FIN '+' & #b TENSE 'pres' & #b HEAD %a.
#a POS VBD & #a TOKEN %a ==> #a MORPH #b & #b FIN '+' & #b TENSE 'past' & #b HEAD %a.
#a POS MD & #a TOKEN %a ==> #a MORPH #b & #b FIN '+' & #b TENSE 'lex(%a,tense)' & #b HEAD %a.

//Non-finite forms
#a POS VBG & #a TOKEN %a ==> #a MORPH #b & #b FIN '-' & #b HEAD %a & #b FORM 'prpart'.
#a POS VBN & #a TOKEN %a ==> #a MORPH #b & #b FIN '-' & #b HEAD %a & #b FORM 'ppart'.
#a POS VB & #a TOKEN %a ==> #a MORPH #b & #b FIN '-' & #b HEAD %a & #b FORM 'inf'.

//separate finite from non-finite verbs
#a MORPH #b TENSE %b ==> #b AUX '-'.

#a FORM 'ppart' ==> #a ASPECT 'perf'.
#a FORM 'prpart' ==> #a ASPECT 'prog'.

#a aux #b & #b MORPH #c ASPECT %c & #a MORPH #d &
#c HEAD %b & #d HEAD %d
==> #c AUX '+' & #d ASP-AUX #c & #d MAIN '+' & #d HEAD %b %d.

#a cop #b & #b TOKEN %c & #b MORPH #c ASPECT %c &
#c HEAD %b & #a TOKEN %a
==> #c AUX '+' & #d ASP-AUX #c & #d MAIN '+' & #c HEAD %b %a.

//Fusing heads for aux verbs in the main verb (finite aux)
#a aux #b & #b MORPH #c FORM 'inf' & #a MORPH #d &
#c HEAD %b & #d HEAD %d
==> #c AUX '+' & #d ASP-AUX #c & #d MAIN '+' & #d HEAD %b %d.

#a aux:pass #b & #b MORPH #c FORM 'inf' & #a MORPH #d &
#c HEAD %b & #d HEAD %d
==> #c AUX '+' & #d ASP-AUX #c & #d MAIN '+' & #d HEAD %b %d.

#a aux #b & #b MORPH #c TENSE %c & #a MORPH #d &
#c HEAD %b & #d HEAD %d
==> #c AUX '+' & #d AUX #c & #d MAIN '+' & #d HEAD %b %d.

#a aux:pass #b & #b MORPH #c TENSE %c & #a MORPH #d &
#c HEAD %b & #d HEAD %d
==> #c AUX '+' & #d AUX #c & #d MAIN '+' & #d HEAD %b %d.

//#a aux #b & #b MORPH #c TENSE %c & #a MORPH #d FORM 'ppart' ==> #c AUX '+' & #d AUX #c & #d MAIN '+' & #d ASPECT 'perf' & #b ASPECT 'perf'.
//#a aux #b & #b MORPH #c TENSE %c & #a MORPH #d FORM 'prpart' ==> #c AUX '+' & #d AUX #c & #d MAIN '+' & #d ASPECT 'prog'.

#a LEMMA go & #a MORPH #b ASPECT 'prog' &
#a aux #c MORPH #f TENSE %f &
#a xcomp #d & #d MORPH #e &
#b HEAD %b & #e HEAD %e
==> #e AUX #b & #b TENSE %f('fut') & #b MAIN '-' & #e FIN '+' & #e MAIN '+' & #e HEAD %b to %e.

//Simple tense
#a MORPH #b TENSE %b & #b HEAD %c & #b AUX '-' ==> #b TAM #d & #d HEAD '%c' & #d TENSE %b.

//Tense from aux verb
#a MORPH #b MAIN '+' & #b AUX #c & #c TENSE %b &
#c HEAD %d & #b HEAD %c ==> #c TAM #d & #b TAM #d & #d HEAD '%c' & #d TENSE %b.

#a xcomp #b &
#a MORPH #c & #b MORPH #d &
#c FIN '+' & #d FIN '-' &
#c TAM #e &
#e TENSE %b &
#c HEAD %c & #d HEAD %d ==> #d TAM #e & #e HEAD '%c to %d' & #e TENSE %b.

//Aspect
#a TAM #b & #a MAIN '+' & #a ASPECT %a ==> #b ASPECT %a.
#a TAM #b & #a MAIN '+' & #a ASPECT %a & #a ASP-AUX #c ASPECT %b ==> #b ASPECT '%b,%a'.