Simple present tense
Rumus:
(+) Subject + to be (was/were) + Verb 3 + by + Object
(-) Subject + to be (was/were) + Not + Verb 3 + by + Object
Contoh:
(+) The candy is eaten by Jamal
(-) The candy is not eaten by Jamal
Simple past tense
Rumus:
(+) Subject + to be (was/were) + V3 + by + Object
(-) Subject + to be (was/were) + Not + V3 + by + Object
Contoh:
(+) My book was kept by him
(-) My book was not kept by him
Present continuous tense
Rumus:
(+) Subject + to be (am, are, is) + Being + V3 + by + Object
(-) Subject + to be (am, are, is) + Not + Being + V3 + by + Object
Contoh:
(+) The latter is being written by Gerald
(-) The latter is being written by Gerald
Past continuous tense
Rumus:
(+) Subject + to be (was/were) + Being + V3 + by + Object
(-) Subject + to be (was/were) + Not + Being + V3 + by + Object