Passive Voice with Mixed Tenses

The passive voice is often used in describing processes, i.e. how a machine works. It is important for technical employees.

In an active sentence we talk about the subject of a sentence:
i.e. The warehouse worker (subject) loaded (verb) the pallet (object) into the truck.

In a passive sentence we talk about the object:
i.e. The pallet (object) was loaded (verb) into the truck by the warehouse worker (subject).
Here the speaker is more interested in the pallet, rather than who loaded it.
“ was loaded ” is what we call the passive voice.

The pallet is moved along the conveyor.
The pallets are moved along the conveyor.
The pallets are not loaded manually.
How are the pallets moved?

The pallet is being moved along the conveyor.
The pallets are being moved along the conveyor.
The pallets are not being loaded manually.
How are the pallets being moved?

The pallet was moved along the conveyor.
The pallets were moved along the conveyor.
The pallets were not loaded manually.
How were the pallets moved?

The pallet was being moved along the conveyor.
The pallets were being moved along the conveyor.
The pallets were not being loaded manually.
How were the pallets being moved?

The pallet has been moved along the conveyor.
The pallets have been moved along the conveyor.
The pallets have not been loaded manually.
How have the pallets been moved?

The pallet will be moved along the conveyor.
The pallets will be moved along the conveyor.
The pallets will not be loaded manually.
How will the pallets be moved?