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Example 4 Who bought the book?/*Who did buy the book? (Pesetsky & Torrego 2001:357)
Initial Stream: ['book', 'n_sg_3rd', 'the', 'buy', 'v*', ['n_sg_3rd_wh', 'who'], 'Tpast', 'C_Q']

Successful Derivation 1


Merge 1
Merge: set-Merge
Stream: ['the', 'buy', 'v*', ['n_sg_3rd_wh', 'who'], 'Tpast', 'C_Q']
Unlabeled:


Merge 2
Merge: pair-Merge
Stream: ['buy', 'v*', ['n_sg_3rd_wh', 'who'], 'Tpast', 'C_Q']
Label stays
the same:



Merge 3
Merge: set-Merge
Stream: ['v*', ['n_sg_3rd_wh', 'who'], 'Tpast', 'C_Q']
Unlabeled:


Merge 4
Merge: set-Merge
Stream: [['n_sg_3rd_wh', 'who'], 'Tpast', 'C_Q']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:


Substream
Stream: ['who', 'n_sg_3rd_wh']

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

Main Stream


Merge 6
Merge: set-Merge
Stream: [['who', 'n_sg_3rd_wh'], 'Tpast', 'C_Q']
Unlabeled:


Merge 7
Merge: set-Merge
Stream: ['C_Q']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:


Merge 8
Merge: set-Merge
Stream: []
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Access Box: who+C_Q
Crash (Unlabeled):

Backtrack (check for another possible derivation: Free Merge): Attempt: #2
Continued from Merge 7

Merge 9
Merge: set-Merge
Stream: []
Unlabeled:


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

Label from
Head:

Label via
shared features:

Label from
Head:

Label from
Head:

FormCopy:
Label via
movement:

FormCopy:
Access Box: who+C_Q
Transfer:
Frontier:

Spell Out: who+CQ T(Past,3rd,sg) v* buy the n book
PF Rules: who CQ+T(Past,3rd,sg)
who did buy the book

Successful Derivation 1
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Backtrack (check for another possible derivation: Free Merge): Attempt: #3
Continued from Merge 3

Merge 11
Merge: set-Merge
Stream: ['v*', ['n_sg_3rd_wh', 'who'], 'Tpast', 'C_Q']
Unlabeled:


Merge 12
Merge: set-Merge
Stream: [['n_sg_3rd_wh', 'who'], 'Tpast', 'C_Q']
Operations: Checked Features: 'uPerson' 'uNumber' 'uGender'
Unlabeled:
Label from
Head:

Label from
Head:

Label from
Head:

Label from
Head:

FormCopy:
Crash (Unlabeled):

# of Backtracks: 2
# of Crashes: 2
# of Successful Derivations: 1

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