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Verb Charts
Stem + Tense Sign + Ending = Verb Form
Tense | Active | Passive
Present | Yes | Yes
Imperfect | Yes | Yes
Future | Yes | Yes
Perfect | Yes | **
Pluperfect | Yes | **
Future Perfect | Yes | **
This is the formula by which (most) Latin verbs can be formed. This formula can be used for the following tenses. 

** The perfect, pluperfect, and future perfect tenses use the 4^th principal part.
Stems
Tense | Stem | Found by…

Present Active/Passive

Present

Dropping the –re from the 2^nd
 principal part

Imperfect Active/Passive | Present | [same]
Future Active/Passive | Present | [same]
Perfect Active | Perfect | Dropping the –i from the 3^rd principal part
Pluperfect Active | Perfect | [same]
Future Perfect Active | Perfect | [same]

Tense Sign
Tense | Sign
Present Active/Passive | None
Imperfect Active/Passive | BA
Future Active/Passive | BI
Perfect Active | None
Pluperfect Active | ERA
Future Perfect Active | ERI

Personal Ending Chart

Singualar

Present
Active

Present 
Passive

Perfect 
Passive

Pronoun

1^st person | o, m | or | i | I
2^nd person | s | ris | isti | you
3^rd person | t | tur | it | he, she,it
Plural | | | |
1^st person | mus | mur | imus | we
2^nd person | tis | mini | istis | You
3^rd person | nt | ntur | erunt | they

The Perfect Passive System
4^th Principal Part + (Form of SUM)
Example verb: amo, amare, amavi, amatus
Tense | Principal Part | Tense of SUM

Perfect

4^th principal part
(amatus, a, um)

Present Tense
(sum, es, est, sumus, estis, sunt)

Pluperfect

4^th principal part
(amatus, a, um)

Imperfect Tense
(eram, eras, erat, eramus, eratis, erant)

Future Perfect

4^th principal part
(amatus, a, um)

Future Tense
(ero, eris, erit, erimus, eritis, erunt)