principal parts
noun /ˌprɪnsəpl ˈpɑːts/
/ˌprɪnsəpl ˈpɑːrts/
[plural] (grammar)- the forms of a verb from which all the other forms can be made. In English these are the infinitive (for example swim), the past tense (swam) and the past participle (swum).Topics Languagec2