active and passive sentences

Some examples of active and passive sentences:

ACTIVE: They speak English.
PASSIVE: English is spoken.

ACTIVE: They spoke English.
PASSIVE: English was spoken.

ACTIVE: They will speak English.
PASSIVE: English will be spoken.

ACTIVE: They are going to speak English.
PASSIVE: English is going to be spoken.

ACTIVE: They are speaking English.
PASSIVE: English is being spoken.

ACTIVE: They were speaking English.
PASSIVE: English was being spoken.

ACTIVE: They have spoken English.
PASSIVE: English has been spoken.

ACTIVE: They had spoken English.
PASSIVE: English had been spoken.

ACTIVE: They will have spoken English.
PASSIVE: English will have been spoken.

5. Perfect progressive verb forms are generally used in active voice only. That is, these are good English sentences:

ACTIVE: They have been speaking English.
ACTIVE: They had been speaking English.
ACTIVE: They will have been speaking English.

But sentences like these are rarely used:

PASSIVE: English has been being spoken.
PASSIVE: English had been being spoken.
PASSIVE: English will have been being spoken.