Why did you not agree to my proposal?

Why was my proposal not agreed to by you?

Why is my proposal not agreed to by you?

Why will my proposal not agreed to by you?

Why can my proposal not agreed to by you?

All of the above

Active Voice: Why did you not agree to my proposal?

Passive Voice: Why was my proposal not agreed to by you?

Past Indefinite tense

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

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