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+--1 Phrase: Phrases and Utterances
+
+abstract Phrase = Cat ** {
+
+-- When a phrase is built from an utterance it can be prefixed
+-- with a phrasal conjunction (such as "but", "therefore")
+-- and suffixing with a vocative (typically a noun phrase).
+
+  fun
+    PhrUtt   : PConj -> Utt -> Voc -> Phr ; -- but come here, my friend
+
+-- Utterances are formed from sentences, questions, and imperatives.
+
+    UttS      : S   -> Utt ;                -- John walks
+    UttQS     : QS  -> Utt ;                -- is it good
+    UttImpSg  : Pol -> Imp -> Utt;          -- (don't) love yourself
+    UttImpPl  : Pol -> Imp -> Utt;          -- (don't) love yourselves
+    UttImpPol : Pol -> Imp -> Utt ;         -- (don't) sleep (polite)
+
+-- There are also 'one-word utterances'. A typical use of them is
+-- as answers to questions.
+-- *Note*. This list is incomplete. More categories could be covered.
+-- Moreover, in many languages e.g. noun phrases in different cases
+-- can be used.
+
+    UttIP   : IP   -> Utt ;                 -- who
+    UttIAdv : IAdv -> Utt ;                 -- why
+    UttNP   : NP   -> Utt ;                 -- this man
+    UttAdv  : Adv  -> Utt ;                 -- here
+    UttVP   : VP   -> Utt ;                 -- to sleep
+
+-- The phrasal conjunction is optional. A sentence conjunction
+-- can also used to prefix an utterance.
+
+    NoPConj   : PConj ;                      
+    PConjConj : Conj -> PConj ;             -- and
+
+-- The vocative is optional. Any noun phrase can be made into vocative,
+-- which may be overgenerating (e.g. "I").
+
+    NoVoc   : Voc ;
+    VocNP   : NP -> Voc ;                   -- my friend
+
+}