GROUP 1- Irregular verbs which have all the same three forms.
GROUP 2- Irregular verbs which have the same past and past participle forms, in three subgroups:
a) ending in -D
b) ending in -GHT
c) ending in -T
GROUP 3- Irregular verbs which have three different forms for present, past and past participle, in another three subgroups:
a) ending in -EN
b) having the series E/-WN
c) having the vowel series I/A/U (begin/began/begun)
Video on the same topic:
For a more complete chart, link to previous post
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