THEAETETUS: Yes.
STRANGER: Yes, for he now arrives at the point of giving an intimation about something which is, or is becoming, or has become, or will be. And he not only names, but he does something, by connecting verbs with nouns; and therefore we say that he discourses, and to this connexion of words we give the name of discourse.
THEAETETUS: True.
STRANGER: And as there are some things which fit one another, and other things which do not fit, so there are some vocal signs which do, and others which do not, combine and form discourse.
THEAETETUS: Quite true.
STRANGER: There is another small matter.
THEAETETUS: What is it?
STRANGER: A sentence must and cannot help having a subject.
THEAETETUS: True.
STRANGER: And must be of a certain quality.