Question

the verb to be is one of the moste important verbs in english

Answer 1

os verbo to be significa o verbo "ser" ou o verbo "está" . cada pronome tem um , e caso seja usado sem o pronome fica apenas to be mesmo.
os pronomes com cada verbo to be q te corresponde:
I = AM
he = is
she = is
it = is
You = are
we = are
they = are