CS 4341 Homework #4 Solutions

Problem 1:

Exercise 28.1. Do not turn this in.

The verb phrase in "Sarah will go to the park by car" is

VP
|
|
_
V
|\
| \
_  \
V   \
|\   PP 
| \    \
V  PP   \
|   |    by car
|   |
go  to the park

The verb phrase in "Sarah will go to the park by the river" is

VP
|
|
_
V   
|\  
| \ 
V  PP
|   |
|   |
go  _
    P
    |\
    | \
    P  NP
    |  | 
    |  | 
   to  the park by the river

Problem 2:

Exercise 28.5.

Part 1.
The phrase "on the corner" must apply to "the library" and so must be attached to an N-bar node headed by library. If the PP "in the afternoon" comes between "the library" and "on the corner", it would have to apply to the library, which is ungrammatical.

Part 2.
There is no place to the right where the PP "on the corner" could have come from. If the phrase had been on the right, it would have complemented a V-bar node, headed by "return". This would falsely imply that "on the corner" modified "return", rather than "the library".

Problem 3:

Exercise 6.2. Let the nodes in the tree be labeled as follows:

       A
     /   \
   B       C
  / \     / \
 D   E   F   G
/ \ / \ / \ / \
H I J K L M N O
6 4 8 6 4 0 2 2

List the nodes whose static value does not need to be computed.

K, N, O

Problem 4:

Optional:
Exercise 28.4.

One pronoun is accusative and the other is nominative because case is assigned to the pronouns' traces, rather than to the moved pronouns. In the sentence "Whom will Sarah return the book to in the afternoon?". the pronoun's trace is governed by the preposition "to", so the pronoun is accusative. In the sentence "Who will return the book to Alex in the afternoon?", the pronoun's trace is governed by the word "will" in an inflection phrase, so the pronoun is nominative.

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