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Example 11 She has been reading a book.
Initial Stream: ['book', 'n_3rd_sg', 'a', 'read', 'v*', ['n_3rd_sg', 'she'], 'Prog', 'Perf', 'Tpres', 'C']

Successful Derivation 1
Successful Derivation 2
Successful Derivation 3
Successful Derivation 4


Merge 1
Merge: set-Merge
Stream: ['a', 'read', 'v*', ['n_3rd_sg', 'she'], 'Prog', 'Perf', 'Tpres', 'C']
Unlabeled:


Merge 2
Merge: pair-Merge
Stream: ['read', 'v*', ['n_3rd_sg', 'she'], 'Prog', 'Perf', 'Tpres', 'C']
Label stays
the same:



Merge 3
Merge: set-Merge
Stream: ['v*', ['n_3rd_sg', 'she'], 'Prog', 'Perf', 'Tpres', 'C']
Unlabeled:


Merge 4
Merge: set-Merge
Stream: [['n_3rd_sg', 'she'], 'Prog', 'Perf', 'Tpres', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:


Substream
Stream: ['she', 'n_3rd_sg']

Merge 5
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 6
Merge: set-Merge
Stream: [['she', 'n_3rd_sg'], 'Prog', 'Perf', 'Tpres', 'C']
Unlabeled:


Merge 7
Merge: set-Merge
Stream: ['Perf', 'Tpres', 'C']
Unlabeled:


Merge 8
Merge: set-Merge
Stream: ['Tpres', 'C']
Unlabeled:


Merge 9
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 10
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #2
Continued from Merge 9

Merge 11
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 12
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n she T(Pres,3rd,sg) have -en be -ing v* read a n book
PF Rules: she T(Pres,3rd,sg)+have
she has -en+be
she has been -ing+read
she has been reading a book

Successful Derivation 1
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #3
Continued from Merge 8

Merge 13
Merge: set-Merge
Stream: ['Tpres', 'C']
Unlabeled:


Merge 14
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 15
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #4
Continued from Merge 14

Merge 16
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 17
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n she T(Pres,3rd,sg) have -en be -ing v* read a n book
PF Rules: she T(Pres,3rd,sg)+have
she has -en+be
she has been -ing+read
she has been reading a book

Successful Derivation 2
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #5
Continued from Merge 7

Merge 18
Merge: set-Merge
Stream: ['Perf', 'Tpres', 'C']
Unlabeled:


Merge 19
Merge: set-Merge
Stream: ['Tpres', 'C']
Unlabeled:


Merge 20
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 21
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #6
Continued from Merge 20

Merge 22
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 23
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n she T(Pres,3rd,sg) have -en be -ing v* read a n book
PF Rules: she T(Pres,3rd,sg)+have
she has -en+be
she has been -ing+read
she has been reading a book

Successful Derivation 3
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #7
Continued from Merge 19

Merge 24
Merge: set-Merge
Stream: ['Tpres', 'C']
Unlabeled:


Merge 25
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 26
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Label via
movement:

Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #8
Continued from Merge 25

Merge 27
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 28
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Label from
Head:

Label via
movement:

Label from
Head:

FormCopy:
Label via
movement:

Transfer:
Frontier:

Spell Out: C n she T(Pres,3rd,sg) have -en be -ing v* read a n book
PF Rules: she T(Pres,3rd,sg)+have
she has -en+be
she has been -ing+read
she has been reading a book

Successful Derivation 4
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #9
Continued from Merge 3

Merge 29
Merge: set-Merge
Stream: ['v*', ['n_3rd_sg', 'she'], 'Prog', 'Perf', 'Tpres', 'C']
Unlabeled:


Merge 30
Merge: set-Merge
Stream: [['n_3rd_sg', 'she'], 'Prog', 'Perf', 'Tpres', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Crash (Unlabeled):

# of Backtracks: 8
# of Crashes: 5
# of Successful Derivations: 4

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