The verbs in perfect passive, pluperfect passive, and future perfect passive tenses conjugate in the same way.

Find the fourth principal part of the verb, make sure it agrees with the noun described,

and add the present, imperfect, or future tense of sum, esse, fuī, futūrus (to be) to the end of the verb as a separate word.

 

amō, amāre, amāvī, amātus (to love)

(Passive)Perfect PluperfectFuture Perfect
Sing. 1stamātus/-a sumamātus/-a eramamātus/-a erō
Sing. 2ndamātus/-a esamātus/-a erāsamātus/-a eris
Sing. 3rdamātus/-a/-um estamātus/-a/-um eratamātus/-a/-um erit
Plu. 1stamātī/-ae sumusamātī/-ae erāmusamātī/-ae erimus
Plu. 2ndamātī/-ae estisamātī/-ae erātisamātī/-ae eritis
Plu. 3rdamātī/-ae/-a suntamātī/-ae/-a erantamātī/-ae/-a erunt