(a.) Protasis denoting past, apodosis present action: #sī ante
voluissēs, essēs; nunc sērō cupis#, Pl. _Tri._ 568, _if you had wished
it before, you might be; as it is, you long too late_. #sī nōn mēcum
aetātem ēgisset, hodiē stulta vīveret#, Pl. _MG._ 1320, _if she hadn’t
spent her life with me, she’d be a fool to-day_. #sī tum illī respondēre
voluissem, nunc rē̆ī pūblicae cōnsulere nōn possem#, _Ph._ 3, 33, _if I
had chosen to answer the man then, I should not be able to promote the
public interest now_. #quō quidem tempore sī meum cōnsilium valuisset,
tū hodiē egērēs, nōs līberī essēmus#, _Ph._ 2, 37, _if by the way at
that time my counsel had been regarded, you, sir, would be a beggar
to-day and we should be free_.
(b.) Protasis and apodosis both referring to past: #ōlim sī advēnissem,
magis tū tum istūc dīcerēs#, Pl. _Cap._ 871, _if I had come before,
you’d have said so then all the more_. #num igitur, sī ad centēsimum
annum vīxisset, senectūtis eum suae paenitēret?# _CM._ 19, _suppose
therefore he had lived to be a hundred, would he have regretted his
years?_ #Indōs aliāsque sī adiūnxisset gentēs, impedimentum maius quam
auxilium traheret#, L. 9, 19, 5, _if he had added the Indians and other
nations, he would have found them a hindrance rather than a help in his
train_.