The features Weak and Strong

Linguistics 322

Intermediate Syntax

The feature [+Weak] means that a form may lower in the syntax. Only affixes and certain operator-words such as not are marked as [+Weak]. Lowering is the least effort. The Least Effort principle, informally stated:

(1)     Principle:     Don't do if you don't have to. 

The reason why T lowers is because it needs a host. Why ot insert a dummy verb right away? Because the insertion of a dummy form belongs to Last Resort, informally stated: 

(2)     Principle:     Do it if nothing else works.

Lowering belongs to the overall principle called 'Move Alpha':

(3)     Principle:     Move a constituent if properly motivated.

T lowers because it is motivated by the need for a host, he is the least effort process.

All other words are marked [-Weak]. This means they cannot lower.

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