Forms of "to be", such as "is", "are", etc. are also verbs of a particular type, called copulas, which define states of being (Jesus is the perfect teacher. Mary is Jesus' mother.) Some languages, such as Russian, do not use copulas in the present tense. | Forms of "to be", such as "is", "are", etc. are also verbs of a particular type, called copulas, which define states of being (Jesus is the perfect teacher. Mary is Jesus' mother.) Some languages, such as Russian, do not use copulas in the present tense. |