1. Verba Latina

2. Normal principal Part Endings
First: -o, -are, -avi, -atum
Second: -eo, -ere, -i, -um
Third: -o, -ere, -i, -um
Third-io: -io, -ere, -i, -um
Fourth: -io, -ire, -ivi, -itum

3. To form the perfect tense...
Put proper gender ending on fourth principal part according to gender of subject.
Use in conjunction with these forms of sum: sum sumus es estis est sunt

4. Perfect Passive

5. To form the pluperfect tense...
Put proper gender ending on fourth principal part according to gender of subject.
Use in conjunction with these forms of sum: eram eramus eras eratis erat erant

6. Pluperfect Passive

7. To form the future perfect tense...
Put proper gender ending on fourth principal part according to gender of subject.
Use in conjunction with these forms of sum: ero erimus eris eritis erit erunt

8. Future Perfect Passive