Verbs categorization

Ehrlich's verb algorithm forces the knowledge engineer to label the verb type when it is input. She chooses four categories, bitransitive, intransitive, transitive and reflexive. This would seem to be bad on two counts.

First, not all instances of verb usage fall into these categories (at least not cleanly). Consider the sentence:

Stop the baby!

(Assume this uttered at playground where a baby has wandered off unattended and is headed for the street.)

The representation for the sentence might look like this:

Here the object is the baby and the act is stop but who is the agent? It is clear that this imperative sentence provides a usage for the verb not covered by one of Ehrlich's verb types.

Second, it is obvious that the struture of the representation, and not an external categorization, should dictate how results are interpreted. This point has been made numerous times.