The main application of the government relation concerns the assignment of case. Government is defined as follows:
A governs B if and only if
- A is a governor and
- A m-commands B and
- no barrier intervenes between A and B.
Governors are heads of the lexical categories (V, N, A, P) and tensed I (T). A m-commands B if A does not dominate B and B does not dominate A and the first maximal projection of A dominates B. The maximal projection of a head X is XP. This means that for example in a structure like the following, A m-commands B, but B does not m-command A:
In addition, barrier is defined as follows: A barrier is any node Z such that
- Z is a potential governor for B and
- Z c-commands B and
- Z does not c-command A
The government relation makes case assignment unambiguous. The tree diagram below illustrates how DPs are governed and assigned case by their governing heads:
Another important application of the government relation constrains the occurrence and identity of traces as the Empty Category Principle requires them to be properly governed.
Read more about this topic: Government And Binding Theory
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