conjugate
verb [ I or T ] language specialized uk/ˈkɒn.dʒə.ɡeɪt/ us/ˈkɑːn.dʒə.ɡeɪt/
（动词）有词形变化;列举（动词）的词形变化
If a verb conjugates, it has different forms that show different tenses, the number of people it refers to, etc., and if you conjugate a verb, you list its different forms.
The verb "to be" conjugates irregularly. 动词 to be 的词形变化是不规则的。