s est, opus
est, necesse est, oportet, constat, praestat, licet, etc.; as,--

nihil in bello oportet contemni, _nothing ought to be despised in war_;

apertum est sibi quemque natura esse carum, _it is manifest that by
nature everybody is dear to himself_.

_B. As Object._

331. The Infinitive with Subject Accusative is used as Object after the
following classes of verbs:

1. Most frequently after verbs of _saying_, _thinking_, _knowing_,
_perceiving_, and the like (_Verba Sentiendi et Declarandi_). This is the
regular construction of Principal Clauses of Indirect Discourse. Verbs that
take this construction are, among others, the following: sentio, audio,
video, cognosco; puto, judico, spero, confido; scio, memini; dico, affirmo,
nego (_say that ... not_), trado, narro, fateor, respondeo, scribo,
promitto, glorior. Also the phrases: certiorem facio (_inform_), memoria
teneo (_remember_), etc.

Examples:--

Epicurei putant cum corporibus simul animos interire, _the Epicureans
think that the soul perishes with the body_;

Thales dixit aquam esse initium rerum, _Thales said that water was the
first principle of the universe_;

Democritus negat quicquid esse sempiternum, _Democritus says nothing is
everlasting;_

spero eum venturum esse, _I hope that he will come_.

II. With jubeo, _order_, and veto, _forbid_; as,--

Caesar milites pontem facere jussit, _Caesar ordered the soldiers to
make a bridge_.

a. When the name of the person who is ordered or forbidden to do
something is omitted, the Infinitive with jubeo and veto is put in the
Passive; as, Caesar pontem fieri jussit.

III. With patior and sino, _permit_, _allow_; as,--

nullo se implicari negotio passus est, _he did not permit himself to be
involved in any difficulty_.

IV. With volo, nolo, malo, cupio, when the Subject of the Infinitive is
different from that of the governing verb; as,--

nec mihi hunc errorem extorqueri volo, _nor do I wish this error to be
wrested from me_;

eas res jactari nolebat, _he was unwilling that these matters should be
discussed_;

te tua frui virtute cupimus, _we desire that you enjoy your worth_.

a. When the Subject of both verbs is the same, the simple Infinitive is
regularly used in accordance with Sec. 328, 1. But exceptions occur,
especially in case of esse and Passive Infinitives as,--

cupio me esse clementem,