A sentence represents an EVENTUALITY. An eventuality is an action or an event or a state of affairs: something that happens or something that is. The sentence represents an eventuality by separating out the type of eventuality from the abstract or concrete things which are involved in the eventuality. The type of the eventuality is prototypically represented by the verb, and the abstract or concrete things involved in the eventuality are prototypically represented by noun phrases. ‘Prototypically’ here implies that this is the usual case, but other word and phrase classes can do the same job.