The fourth chapter holds the irregular verbs.
Some of these verbs are indicated as verb-endings (e.g. ~tenere). This means that all tenere-verbs (e.g. mantenere, trattenere) are built following the conjugation rules for the tenere-verb.
Irregular verbs:
A
B
C
D
E
F
G
I
L
M
N
O
P
R
S
T
U
V
also see:
Chapter 1: General Information
Chapter 2: The regular verbs
Chapter 3: The irregular verb-endings
Chapter 4: The irregular verbs
Chapter 5: Appendix