Change the following from active to passive:
We shall have dispatched the invitations before Friday evening.

Correct option is D

The correct passive voice of the given sentence is (d) The invitations shall have been dispatched before Friday evening.
Explain the rules of conversion (Active → Passive) with structure in detail:
Active voice: Subject + shall have + V³ + Object + time
→ We + shall have dispatched + the invitations + before Friday evening.
Passive voice: Object + shall have been + V³ + (by + subject) + time
→ The invitations + shall have been dispatched + (by us) + before Friday evening.
Structure:
· Active: S + shall/will have + V³ + O
· Passive: O + shall/will have been + V³ + (by + S)
· Example (rule used): They will have completed the work. → The work will have been completed (by them).
· Why other options are incorrect:
· (a) Missing been; incorrect passive formation.
· (b) “have had been” is wrong and unnecessarily double-perfect.
· (c) “have be” is grammatically incorrect; must be “have been.”