Türkçeye “Devam eden, gelecekte tamamlanmış zaman” olarak çevirebileceğimiz tense.

Olumlu cümle yapısı:

I/You/We/They/He/She/It + will have been+ Ving

Olumsuz cümle yapısı:

I/You/We/They/He/She/It + will not/won’t have been+ Ving

Soru cümle yapısı:

Will + I/You/We/They/He/She/It + have been+ Ving

Future Perfect Continuous Tense kullanırken, Future Perfect Tense'in aksine, süreci ön planda tutarız.

At 6.00 PM, he will have been driving for five straight hours. (Akşam saat 6.00’da, beş saatir araba sürmekte/sürüyor olacak.)
We will have been studying English all afternoon. (Tüm öğleden sonra İngilizce çalışıyor olacağız.)
How long will you have been dating on May 7th? (7 Mayısta, ne kadar süredir çıkıyor olacaksınız?)

Future Perfect Continuous Tense ile genelde olumsuz cümle kurmayız.

Will you have been reading this book for two days? (Bu kitabı iki gündür okuyor olacak mısın?)
She will not be reading this book for two days. (İki gündür bu kitabı okumakta olamayacak.)

Aslında, böyle bir soruya, şu şekilde cevap versek daha iyi olabilir.
No, I do not think so.

EXAMPLE

I will have been cleaning the house all day. (Bütün gün evi temizlemekte/temizliyor olacağım.)
You will have been sleeping in your bed all morning. (Bütün sabah yatağında uyumakta/uyuyor olacaksın.)
We will have been standing there for hours. (Saatlar boyunca orada durmakta/duruyor olacağız.)
They will have been reading this book for two days. (Bu kitabi iki gündür okumakta/okuyor olacaklar.)
He will have been repairing the car. (Arabayı tamir etmekte/ediyor olacak.)
She will have been staying with us since Tuesday. (Salıdan beri bizle kalmakta/kalıyor olacak.)
It will have been raining in London. (Londra’da yağmıur yağmakta/yağıyor olacak.)
By the time I finish my degree, I will have been studying for six years.
They will have been building the new bridge for over a decade when it finally opens.
By next month, she will have been working at the company for ten years.
By the time he retires, he will have been teaching English for 30 years.
When they arrive at the party, they will have been driving for five hours straight.
By the end of the year, we will have been living in this house for ten years.
In five years’ time, they will have been saving for their dream vacation for a decade.
By next summer, I will have been practicing yoga for five years.
By the time the project is completed, they will have been working on it for two years.
In a few months, she will have been running her own business for a decade.