D. Substantive Clauses introduced by Quīn.
[298]. Substantive Clauses introduced by quīn (used sometimes as subject, sometimes as object) occur after negative and interrogative expressions of doubt, omission, and the like, particularly after nōn dubitō, I do not doubt; quis dubitat, who doubts?; nōn (haud) dubium est, there is no doubt. The mood is the Subjunctive. Examples:—
quis dubitat quīn in virtūte dīvitiae sint, who doubts that in virtue there are riches?
nōn dubium erat quīn ventūrus esset, there was no doubt that he was about to come.
a. In Nepos, Livy, and post-Augustan writers an Infinitive sometimes takes the place of the quīn-clause after nōn dubitō; as,—
nōn dubitāmus inventōs esse, we do not doubt that men were found
b. Nōn dubitō, I do not hesitate, is regularly followed by the Infinitive, though sometimes by a quīn-clause.
E. Substantive Clauses Introduced by Quod.
[299]. 1. Quod, the fact that, that, introduces Substantive Clauses in the Indicative. This construction occurs especially—
a) In apposition with a preceding demonstrative, as hōc, id, illud, illa, ex eō, inde, etc. Thus:—
illud est admīrātiōne dignum, quod captīvōs retinendōs cēnsuit, this is especially worthy of admiration, that he thought the prisoners ought to be kept;
hōc ūnō praestāmus vel maximē ferīs, quod colloquimur inter nōs, in this one respect we are especially superior to the beasts, that we talk with each other.