Latin Verbs:

voice: active, passive

mood: indicative, subjunctive, imperative, infinitive

tense: present, imperfect, future, perfect, pluperfect, future perfect

number: singular, plural

person: 1st, 2nd, 3rd

verbal adjective: participle

verbal noun: gerund, supine

Four Stems: 

present stem (1), active present infinitive (0), perfect stem (2), participial stem (3).

am-o (1) amare (0) amav-i (2) amat-um (3) - love
hab-eo (1) habere (0) habu-i (2) habit-um (3) - have
mitt-o (1) mittere (0) mis-i (2) miss-um (3) - send
aud-io (1) audire (0) audiv-i (2) audit-um (3) - hear

* * *
Active - Indicative: Active - Subjunctive: Passive - Indicative: Passive - Subjunctive:
Present (1) Present (1) Present (1) Present (1)
Imperfect (1) Imperfect (1) Imperfect (1) Imperfect (1)
Future (1) Future (1)
Perfect (2) Perfect (2) Perfect (3) Perfect (3)
Pluperfect (2) Pluperfect (2) Pluperfect (3) Pluperfect (3)
Future perfect (2) Future perfect (3)

  

Active - Imperative Active - Infinitive Passive - Infinitive
Present (1) Present (0) Present (1)
Perfect (2) Perfect (3)
Future (3)

Active - Participle Passive - Participle Gerund Supine
Present (1) (1) (3)
Perfect (3)
Future (3) Future (1)