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Example 8 Mary thinks that Sue will buy the book. (Pesetsky & Torrego 2001:357, originally from Stowell 1981)
Initial Stream: ['book', 'n_sg_3rd', 'the', 'buy', 'v*', ['n_sg_3rd', 'Sue'], 'will', 'Tpres', 'that', 'think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']

Successful Derivation 1
Successful Derivation 2


Merge 1
Merge: set-Merge
Stream: ['the', 'buy', 'v*', ['n_sg_3rd', 'Sue'], 'will', 'Tpres', 'that', 'think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:


Merge 2
Merge: pair-Merge
Stream: ['buy', 'v*', ['n_sg_3rd', 'Sue'], 'will', 'Tpres', 'that', 'think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Label stays
the same:



Merge 3
Merge: set-Merge
Stream: ['v*', ['n_sg_3rd', 'Sue'], 'will', 'Tpres', 'that', 'think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:


Merge 4
Merge: set-Merge
Stream: [['n_sg_3rd', 'Sue'], 'will', 'Tpres', 'that', 'think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:


Substream
Stream: ['Sue', 'n_sg_3rd']

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

Main Stream


Merge 6
Merge: set-Merge
Stream: [['Sue', 'n_sg_3rd'], 'will', 'Tpres', 'that', 'think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:


Merge 7
Merge: set-Merge
Stream: ['Tpres', 'that', 'think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:


Merge 8
Merge: set-Merge
Stream: ['that', 'think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 9
Merge: set-Merge
Stream: ['think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:
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 8

Merge 10
Merge: set-Merge
Stream: ['that', 'think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:


Merge 11
Merge: set-Merge
Stream: ['think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:
Label from
Head:

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:



Merge 12
Merge: set-Merge
Stream: ['v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:


Merge 13
Merge: set-Merge
Stream: [['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:

Substream
Stream: ['Mary', 'n_sg_3rd']

Merge 14
Merge: set-Merge
Stream: []
Unlabeled:

Main Stream


Merge 15
Merge: set-Merge
Stream: [['Mary', 'n_sg_3rd'], 'Tpres', 'C']
Unlabeled:


Merge 16
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 17
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: #3
Continued from Merge 16

Merge 18
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 19
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:

Transfer:
Frontier:

Spell Out: C n Mary T(Pres,3rd,sg) v think that n Sue T(Pres,3rd,sg) will v* buy the n book
PF Rules: Mary T(Pres,3rd,sg)+think
Mary thinks that Sue T(Pres,3rd,sg)+will
Mary thinks that Sue will buy the book

Successful Derivation 1
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #4
Continued from Merge 7

Merge 20
Merge: set-Merge
Stream: ['Tpres', 'that', 'think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:


Merge 21
Merge: set-Merge
Stream: ['that', 'think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 22
Merge: set-Merge
Stream: ['think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:
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: #5
Continued from Merge 21

Merge 23
Merge: set-Merge
Stream: ['that', 'think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:


Merge 24
Merge: set-Merge
Stream: ['think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
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 via
movement:



Merge 25
Merge: set-Merge
Stream: ['v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:


Merge 26
Merge: set-Merge
Stream: [['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:

Substream
Stream: ['Mary', 'n_sg_3rd']

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

Main Stream


Merge 28
Merge: set-Merge
Stream: [['Mary', 'n_sg_3rd'], 'Tpres', 'C']
Unlabeled:


Merge 29
Merge: set-Merge
Stream: ['C']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 30
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: #6
Continued from Merge 29

Merge 31
Merge: set-Merge
Stream: ['C']
Unlabeled:


Merge 32
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:

Transfer:
Frontier:

Spell Out: C n Mary T(Pres,3rd,sg) v think that n Sue T(Pres,3rd,sg) will v* buy the n book
PF Rules: Mary T(Pres,3rd,sg)+think
Mary thinks that Sue T(Pres,3rd,sg)+will
Mary thinks that Sue will buy the book

Successful Derivation 2
Top

Backtrack (check for another possible derivation: Free Merge): Attempt: #7
Continued from Merge 3

Merge 33
Merge: set-Merge
Stream: ['v*', ['n_sg_3rd', 'Sue'], 'will', 'Tpres', 'that', 'think', 'v', ['n_sg_3rd', 'Mary'], 'Tpres', 'C']
Unlabeled:


Merge 34
Merge: set-Merge
Stream: [['n_sg_3rd', 'Sue'], 'will', 'Tpres', 'that', 'think', 'v', ['n_sg_3rd', 'Mary'], '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: 6
# of Crashes: 5
# of Successful Derivations: 2

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