principal parts

(in English) those forms of a verb (ie the infinitive, past tense and past participle) from which all other forms can be derived （英语中动词的）主要部分（即不定式、 过去式和过去分词）.

primitively, primitiveness, primly, primness, primogeniture, primordial, primordially, primp, primrose, primula, Primus, prince, Prince Consort, princedom, princely, princess, Princeton, Princeton University, principal, principal boy, principality, principally, principle, principled, print, printable, printed circuit, printed matter (also ,printed `papers), printer, printing, printout, prior, prior to, priority, priory, prise, prise (also esp US prize), prism, prismatic, prison,