With the predicate dicere we find besides the AcI construction also embedded predications in the form of an ut-clause, where the ut-clause in its turn may be replaced by a prolative infinitive (see K.–St. I. 683).
(38b) dices (eis) … paulum proferant auctionem (38b') dices (eis) auctionem proferre 
(38b) dices (eis) … paulum proferant auctionem
(38b') dices (eis) auctionem proferre The ut-clause and the prolative infinitive construction with dicere are subject to the same restrictions that we saw above for the prolative infinitive with admonere and the ut-clause with hortari: the embedded predication must be `controlled', and cannot, therefore, be passive; anteriority of the infinitive is impossible; in the embedded predications expressions like nimirum, fortasse, haud dubie are excluded.  The modality of the embedded predication is imperative (see crosssection 7.2.3.), whereas this modality is declarative in the case of the AcI. Other predicates which allow embedded predications with declarative or imperative modality are the verbs of communication, respondere (`to answer'), scribere (`to write'), clamare (`to shout'), nuntiare (`to report'), etc. We also find this alternation with a number of two-place verba sentiendi: decernere (`to determine'), statuere (`to decide'), cogitare (`to consider'), etc.  As was stated above, admonere also belongs to the class of verbs that allow both an embedded predication with declarative modality (= admonere aliquem + AcI) and an embedded predication with imperative modality (= admonere aliquem + ut-clause or prolative infinitive). Schematically, this may be represented as table 7.6.
|Predicate (incl. Subject)||Addressee||content|
|dico||tibi||me abire||abire/ut abeas|
|admoneo||te||me abire||abire/ut abeas|
|statuo||Ø||me abire (= to determine that)||abire/ut abeam (= to decide to)|
From this table it appears that the ut-clause and the prolative infinitive construction are synonymous and that they are in opposition to the AcI-construction (but see above crosssection 7.4.3. about iubere). Incidentally, the verbs with
which ut-clause and prolative infinitive constructions are or ought to be possible differ in the extent to which we actually find the two constructions. There is, especially in poetry (see K.–St. I.680), a general tendency in favour of the infinitive construction. 
Pinkster, Harm (1942-) , Latin Syntax and Semantics [info], xii, 320 p.: ill.; 24 cm. [word count] [Pinkster].