We see them every week.
Present Simple Passive
The birds are seen every spring.
We are seeing the doctor this afternoon.
Present Continuous Passive
The patient is being seen by the doctor at the moment.
We haven't seen each other for years.
Present Perfect Passive
They haven't been seen by anyone for a long time.
Present Perfect Continuous
We have been seeing each other for three months.
Jack saw Peter last weekend.
Past Simple Passive
Peter was seen at the beach last weekend.
We were seeing each other when we had the argument.
Past Continuous Passive