The principal parts of a verb are
Apresent tense, present participle, past tense, past participle.
Bpresent tense, past tense, future tense.
Cbase form, past tense, past participle, future tense.
Dbase form, helping verb, past participle.
Apresent tense, present participle, past tense, past participle.
Bpresent tense, past tense, future tense.
Cbase form, past tense, past participle, future tense.
Dbase form, helping verb, past participle.