PASSIVE VOICE (2-A)

TENSES/ACTIVE/PASSIVE
present simple/The postman delivers letters./Letters are delivered .
present continuous/The postman is delivering letters./Letters are being delivered.
past simple/The postman delivered letters./Letters were delivered.
past continuous/The postman was delivering letters./Letters were being delivered.
present perfect/The postman has delivered letters./Letters have been delivered.
past perfect/The postman had delivered letters./Letters had been delivered.
future/The postman will deliver letters./Letters will be delivered.
going to future/The postman is going to deliver letters./Letters are going to be delivered.
must/The postman must deliver letters./Letters must be delivered.
can/The postman can deliver letters./Letters can be delivered.
may/The postman may deliver letters./Letters may be delivered.
ought to/The postman ought to deliver letters./Letters ought to be delivered.
used to/The postman used to deliver letters/Letters used to be delivered