Sajid believed that Asif and Anwar would help Ahmed.

It was believed by Sajid that Ahmed would be helped by Asif and Anwar

It is believed by Sajid that Ahmed would be helped by Asif and Anwar

It will be believed by Sajid that Ahmed would be helped by Asif and Anwar

It should be believed by Sajid that Ahmed would be helped by Asif and Anwar

All of the above

Past Indefinite tense

Active Voice= Subject + Second Form of Verb + Object.

Passive Voice = Object + was/were + third of verb + by + subject.