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A regular English verb has only one principal parts the infinitive or dictionary form (which is identical to the simple present tense for all persons and numbers except the third person singular).
All other forms of a regular verb can be derived straightforwardly from the infinitive, for a total of four forms (e.g. exist, exists, existed, existing)
English irregular verbs (except to be) have at most three principal parts:
Infinitive ---------write
Preterite ---------wrote
Past Participle ----written
Strong verbs like "write" have all three distinct parts, for a total of five forms (writes,wrote,written,writting)
The more irregular weak verbs also require up to three forms to be learned.
The irregular verb like "to be" has eight forms : be, am, is, are, being, was, were, been, of which only one is derived from a particular part (being is derived from be).
Most of the srtong verbs that survive in modern English are considered irregular.
(source: wikipedia)
All other forms of a regular verb can be derived straightforwardly from the infinitive, for a total of four forms (e.g. exist, exists, existed, existing)
English irregular verbs (except to be) have at most three principal parts:
Infinitive ---------write
Preterite ---------wrote
Past Participle ----written
Strong verbs like "write" have all three distinct parts, for a total of five forms (writes,wrote,written,writting)
The more irregular weak verbs also require up to three forms to be learned.
The irregular verb like "to be" has eight forms : be, am, is, are, being, was, were, been, of which only one is derived from a particular part (being is derived from be).
Most of the srtong verbs that survive in modern English are considered irregular.
(source: wikipedia)
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