Government and Binding Theory/Case Filter
An important concept in Case Theory is the Case Filter. It posits that all DPs must have abstract case.
Every phonetically realised DP must have abstract Case.
This explains why DPs and APs never take PP complements:
(1a) *the help John
(1b) *happy the incident
Does this remind you of anything? Yes, we briefly mentioned this puzzle near the beginning of the book!
The case for the Case FilterEdit
Principle of AdjacencyEdit
Case Filter and A-MovementsEdit
A-movements are motivated by the Case Filter. Let's use an example.
(2a) D-structure of (3b): — was killed he (2b) S-structure of (3b): he was killed —
To satisfy the Extended Projection Principle, it seems that we can simply fill up the subject position of (2c) using a pleonastic it, but this is not possible:
(2c) *It was killed he
Why is this? The Case Filter comes to the rescue. he cannot be assigned Case in (2a) because passive verbs cannot assign accusative Case, as we will see later. Thus (2c) is not possible. Instead, the DP in object position moves to subject position in S-Structure, where the inflection assigns nominative Case to it.
Burzio's generalisation captures the properties of unaccusative, raising and passive verbs at once:
Burzio's generalisation relates the θ-marking and case-assigning properties of verbs. Verbs that can assign accusative Case do not have external arguments, and vice versa. This necessitates movement:
|Verb||Internal argument||External argument||Nominative Case||Accusative Case|
|Transitive (e.g. take)||✓||✓||✓||✓|
|Intransitive (e.g. jump)||✓||✓||✓|
|Unaccusative (e.g. come), ergative verbs (e.g. melt) passive (e.g. be eaten), raising (e.g. seem)||✓||✓|
You may be wondering how intransitive verbs assign accusative Case. The answer lies in cognate objects. Intransitive verbs can carry cognate objects, but not unaccusative, ergative, passive or raising verbs:
(3a) He lives a great life.
(3b) *He came a great coming.
(3c) *He melted a great melt. (3d) *He was killed a great kill.
(3e) *He appeared a great appearance.
We can now also explain raising verbs:
(4a) It seemed that he had finished his homework.
(4b) *It seemed that he to have finished his homework.
(4c) He seemed to have finished his homework.
(5a) It is thought that he had finished his homework.
(5b) *It is thought that he to have finished his homework.
(5c) He is thought to have finished his homework.
In (4a) and (5a), the finite inflection assigned nominative Case to he, so it's all good. We used a pleonastic subject as no external argument could be assigned. In (4b) and (5b), to cannot assign nominative Case to he. He violated the Case filter, resulting in (4c) and (5c), in which the subject of the lower IP moved to the beginning.