We use it to talk about "short actions now" and for "future timetables"

Action finished before another past action.

"The government will be making a statement later"

We use it to talk about planned actions in the future

"Twice a month", "on Fridays", "often", and "sometimes" are time expressions used to talk about habits and/or routines in this tense commonly.

"She's been thriving since they settled her divorce"

"It had been raining all night"

When we predict the future using this form, we are guessing actually

We use this one for promises and spontaneous actions

The following expressions go together well with two future tenses: by three o'clock, by Friday, when + present simple, by the time + present simple.

We relate it to words as just, yet, since, already, for and recently

We use it in the 2nd Conditional to talk about unreal or imaginary situations

"In April, she will have been teaching for twelve years"

We use it to talk about planned actions in the near future

"Since 2010", "since July", "for ten years" and "for three days" are time expressions that work well with these two tenses

Also useful when talking about annoying habits

"I was working in the garden all day"

By ten o'clock, I will have finished my homework.

We can use this one to talk about a past habits or states

We use this tense the words "when" or "while" and the Past Simple, to show how two actions overlap or to add background elements to a story