monadic verbs

AnatbsI have just recently come across the concept "monadic verb" and I don't really understand the meaning of it.
If anyone can be kind enough to explain its menaing to me, with added examples, I'd really appreciate it.

thank you

A verb with only one argument, typically an intransitive verb.

The boy is sleeping.

CJ

So if a monadic verb is an intransitive verb, why are there 2 definitions? unless they do not refer to the same level of definition...

there has to be a difference between them, right?

why are there 2 definitions?

Do you mean, "Why are there two terms for the same phenomenon?"

CJ

A monadic verb only assigns one internal theta role; to its object. That object is then raised to subject position i.e., arrived the train becomes 'the train arrived'

AnonymousThat object is then raised to subject position i.e., arrived the train becomes 'the train arrived'

What is the subject before the object is raised?

CJ

There is no "true" subject in the sentence, there is only a derived subject. The derived subject is the argument that raises from the object position (complement of the verb head), it raises to the specifier of the IP in order to be assigned nominative case (in English, and French, anyway). These intransitive (or monadic) verbs are termed unaccusatives because they fail to assign accusative case t

AnonymousThere is no "true" subject in the sentence, there is only a derived subject. The derived subject is the argument that raises from the object position (complement of the verb head), it raises to the specifier of the IP in order to be assigned nominative case (in English, and French, anyway). These intransitive (or monadic) verbs are termed unaccusatives because th

excellent answer!