1. Perfect Subjunctive System + Infinitives
REVIEW Topic: Week 7
Perfect Subjunctive System + Infinitives

2. Perfect Active System for the Subjunctive Mood
The Perfect Active System is built on the perfect active stem, which is found in the 3rd principal part of any verb.
1st: laudō, laudāre, laudāvī, laudātum
2nd: moneō, monēre, monuī, monitum
3rd: sucō, ducere, duxī, ductum
3rd “io”: capiō, capere, cepī, captum
4th: audiō, audīre, audivī, auditum
The perfect active stem is simply the 3rd principal part minus the “-ī” ending (which is the 1st pers. sing. pf. ind. act. ending):
e.g.- laudāv-, monu-, dūx-, cēp-, audīv-
Though there is no exact way to guess how the 3rd principal part will form if you don’t have it memorized, here are a few of the trends: add “v”/“u”, lengthen internal vowel, add “s”, reduplication, loss of internal nasal, or some combination of the above.

3. Perfect Active Subjunctive
The Perfect Active Subjunctive uses a set of endings, which equates to a combination of -erī- plus the usual personal endings (-m, -s, -t, etc.):
1st sing: -erim
2nd sing: -erīs
3rd sing: -erit
1st pl: -erīmus
2nd pl: -erītis
3rd pl: -erint
You’ll notice that this looks remarkably similar to the Future Perfect Active Indicative, except for the 1st pers. sing. and the presence of the long “ī” in a few places.

4. Perfect Active Subjunctive
To form the Perfect Active Subjunctive, combine the Perf. Stem + -erī- + personal endings
laudō, laudāre, laudāvī, laudātum
ducō, ducere, duxī, ductum
laudāverim
dūxerim
laudāverīs
dūxerīs
laudāverit
dūxerit
laudāverīmus
dūxerimus
laudāverītis
dūxerītis
laudāverint
dūxerint
NB: Though you only have two examples (1st and 3rd conjug.) here, you should know how to conjugate the perfect active subjunctive for any verb, provided that you know the 3rd principal part.

5. Pluperfect Active Subjunctive
To form the Plupf. Act. Subj., combine the perf. act. stem + -issē- + personal endings (note that this really equates to the combination of the Perf. Act. Infinitive + personal endings – compare this to the Imperfect Subjunctive, which is the present infinitive + endings)
laudō, laudāre, laudāvī, laudātum
ducō, ducere, dūxī, ductum
laudāvissem
dūxissem
laudāvissēs
dūxissēs
laudāvisset
dūxisset
laudāvissēmus
dūxissēmus
laudāvissētis
dūxissētis
laudāvissent
dūxissent
NB: Though you only have two examples (1st and 3rd conjug.) here, you should know how to conjugate the pluperfect active subjunctive for any verb, provided that you know the 3rd principal part.

6. Perfect Passive System
The Perfect Passive System is built on the participial stem, which is the 4th principal part of any verb.
1st: laudō, laudāre, laudāvī, laudātum
2nd: moneō, monēre, monuī, monitum
3rd: sucō, ducere, duxī, ductum
3rd “io”: capiō, capere, cepī, captum
4th: audiō, audīre, audivī, auditum
The 4th principal part, which is simply the perfect passive participle, functions as one part of the verbs of the perfect passive system.
The Rule: EVERY verb in the perf. pass. system has two parts: A perf. pass. ppl. + a form of sum
Because the participial part is technically an adjective (as are all participles), it will decline to match the subject in case, number, and gender.
NB: When writing out forms in the perf. pass. system, be sure to include all possible forms of the participle: (-us/-a/-um for sing.; -i/-ae/-a for pl.)

7. Perfect Passive Subjunctive
To form the perf. act. subj., combine the 4th principal part + present subjunctive of sum (make sure the participial part agrees with the subject!)—[note, see review wk 4 ppt. for subj. of sum]
laudō, laudāre, laudāvī, laudātum
ducō, ducere, dūxī, ductum
laudātus, -a, -um sim
ductus, -a, -um sim
laudātus, -a, -um sīs
ductus, -a, -um sīs
laudātus, -a, -um sit
ductus, -a, -um sit
laudātī, -ae, -a sīmus
ductī, -ae, -a sīmus
laudātī, -ae, -a sītis
ductī, -ae, -a sītis
laudātī, -ae, -a sint
ductī, -ae, -a sint
NB: Though you only have two examples (1st and 3rd conjug.) here, you should know how to conjugate the perfect passive subjunctive for any verb, provided that you know the 4th principal part.

8. Pluperfect Passive Subjunctive
To form the pluperf. act. subj., combine the 4th principal part + imperf. subjunctive of sum (but make sure the participial part agrees with the subject!)—[note: see wk 4 review ppt. for impf. subj. of sum]
laudō, laudāre, laudāvī, laudātum
ducō, ducere, dūxī, ductum
laudātus, -a, -um essem
ductus, -a, -um essem
laudātus, -a, -um essēs
ductus, -a, -um essēs
laudātus, -a, -um esset
ductus, -a, -um esset
laudātī, -ae, -a essēmus
ductī, -ae, -a essēmus
laudātī, -ae, -a essētis
ductī, -ae, -a essētis
laudātī, -ae, -a essent
ductī, -ae, -a essent
NB: Though you only have two examples (1st and 3rd conjug.) here, you should know how to conjugate the pluperfect passive subjunctive for any verb, provided that you know the 4th principal part.

9. Sequence of Tenses
Now that we have reviewed all the tenses of the Subjunctive, it’s worth recalling how the Sequence of Tenses works.
Any subordinate use of the subjunctive in Latin will use a specific tense for the dependent verb as dictated by the Sequence of Tenses.
The main verb of the sentence will dictate which sequence the sentence follows:
Primary Sequence = Main verbs in Present, Future, and Perfect tenses
Secondary Sequence = Main verbs in Perfect, Imperfect, and Pluperfect tenses
You may notice that the perfect tense main verb can be treated as primary sequence or as secondary sequence, this is due to its unique emphasis of the “present result” of a “past action,” suggesting both possible periods of time (primary and historical)
Note, too, that “historical” present tense verbs in historical narrative are usually treated as secondary sequence. (We will observe this in the BC)

10. Simultaneous or Subsequent Action
Sequence of Tenses
Simultaneous or Subsequent Action
(Same time as or time after main verb)
Prior or Past Action
(Time before main verb)
Primary
Sequence
(Main Verb = Pres., Fut., Pf.)
Present Subj.
Perfect Subj.
Secondary
(Main Verb = Pf., Impf., Plupf.)
Imperfect Subj.
Pluperfect Subj.
Note, again, that the Sequence of tenses only applies to Subordinate (aka Dependent) uses of the Subjunctive.

11. Infinitives
Infinitives are built on verbal stems, giving them some verbal qualities (tense and voice).
The verbal qualities of infinitives often require that the infinitive has a subject (which will be acc.) and a direct object (also acc.), if active, or an expression of means or agent (abl.), if passive.
In fact, infinitives are really nouns and function as nouns in Latin sentences.
As nouns, infinitives can be the subject of the sentence, the object of a verb or adjective and do many things that verbs otherwise could not do.
In Latin, infinitives occur in the present, perfect, and future tenses. Like participles, these tenses convey time relative to the main verb of the sentence.

12. (stem + -āre, -ēre, -ere, -īre)
Infinitive Box
The following chart gives you a layout about how to form each of the tenses and voices of the infinitive.
Active
Passive
Present
2nd Principal Part
(stem + -āre, -ēre, -ere, -īre)
stem + -ārī, -ērī, -ī, -īrī
Perfect
perf. stem + -isse
perf. pass. ppl. + esse
Future
fut. act. ppl. + esse
[supine in –um + īrī]
Note the fut. pass. Infinitive is extremely rare and has an unusual form. Generally, just don’t worry about it, it will be noted for you when you see it.

13. Infinitive Box – complete example
Here’s an example of the infinitive box filled out for the following verb: agō, agere, ēgī, āctum
Active
Passive
Present
agere
agī
Perfect
ēgisse
āctus, -a, -um esse
Future
ācturus, -a, -um esse
āctum īrī
Note the fut. pass. Infinitive is very uncommon and has an unusual form. Generally, just don’t worry about it, it will be noted for you when you see it.