principal parts
US /ˈprɪnsɪpəl pɑːrts/
UK /ˈprɪnsɪpəl pɑːrts/
1.
the forms of a verb from which all other forms can be derived, typically the infinitive, past tense, and past participle
:
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The principal parts of 'sing' are 'sing,' 'sang,' and 'sung.'
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Understanding the principal parts helps in conjugating verbs correctly.