Irregular verb patterns
7 stem-change and irregularity groups
e → i
32 verbsStem-changing verbs whose stressed e shifts to i.
seguir→sigo
e → ie
100 verbsStem-changing verbs whose stressed e diphthongizes to ie.
pensar→pienso
Cousin: o-to-ue
Fully irregular
16 verbsHighly suppletive verbs (ser, ir, haber): learn forms individually.
ser→soy
g-stem (yo)
52 verbsYo-form inserts a g (tener → tengo).
tener→tengo
o → ue
74 verbsStem-changing verbs whose stressed o diphthongizes to ue.
poder→puedo
Cousin: e-to-ie
y-insertion
29 verbs-uir verbs insert y before vowel endings (huir → huyo).
construir→construyo
zc-stem (-cer/-cir)
72 verbsYo-form inserts zc before -er/-ir ending (conocer → conozco).
parecer→parezco