The Allen and Greenough is still under construction;
so some links may not work quite the way you would expect.
Substantive Clauses of Purpose with Passive Verbs.
566. A Substantive Clause used as the object of a
verb becomes the subject when the verb is put in the passive
(Impersonal Construction): -
- Caesar ut cógnósceret
postulátum est (B. C. i. 87), Caesar was requested
make an investigation (it was requested that Caesar should make an investigation).
- sí erat Héraclió ab
senátú mandátum ut emeret (Verr. iii. 88), if Heraclius had been instructed by the senate to buy.
- sí persuásum erat
Cluvió ut mentírétur (Rosc. Com. 51), if Cluvius had been persuaded to lie.
- putó concédí
nóbís oportére ut Graecó verbó
útámur (Fin. iii. 15), I think we must
be allowed to use a Greek word.
- né quid eís
noceátur á Caesare cavétur (B. C. i. 86), Caesar takes care that no harm shall be done them (care is taken by Caesar lest, etc.).
a. With verbs of admonishing, the
personal object becomes the subject and the object clause is retained: -
- admonití sumus ut
cavérémus (Att. viii. 11 D. 3), we were
warned to be careful.
- cum monérétur ut
cautior esset (Div. i. 51), when he was advised to be
- monérí vísus est
né id faceret (id. 56), he seemed to be
warned not to do it.
b. Some verbs that take an infinitive
instead of a subjunctive are used impersonally in the passive, and the
infinitive becomes the subject of the sentence: -
c. With iubeó, vetó, and cógó, the subject
accusative of the infinitive becomes the subject nominative of
the main verb, and the infinitive is retained as complementary
(Personal Construction): -
- adesse iubentur
postrídié (Verr. ii. 41), they are ordered to
present on the following day.
- íre in exsilium iussus
est (Cat. ii. 12), he was ordered to go into exile.
- Simónidés vetitus est
návigáre (Div. ii. 134), Simonides was
forbidden to sail.
- Mandubií exíre
cóguntur (B. G. vii. 78), the Mandubii are compelled
to go out.