The Future Perfect

The future perfect simple

actions that will finish before a certain point in the future.

“By tomorrow, we will have completed the reconfigurations.”

We often use passive structures for the future perfect simple.

The report will have been started when you return.”

is used to talk about something that began in the past and continues into the future.

“When you arrive back from holiday, we will have been planning the report, so you’ll be able to join in.”

The future perfect continuous generally sounds better in the active form.

~~"The report will have been being planned"~~ ⇒ this does not sound good.

We will have been planning sounds much better.