Past Future Perfect Continuous

Past Future Perfect Continuous adalah bentuk kata kerja yang digunakan untuk:
  1. Menekankan durasi suatu aktivitas yang akan berlangsung sebelum waktu lain atau peristiwa di masa depan dalam kejadian tapi masa lalu di saat berbicara (I would have been sleeping for two hours by the time my brother went home because he would get home at midnight: saya akan tidur selama dua jam pada saat adik saya pulang karena dia akan pulang pada tengah malam) 
  2. Terkadang Past Future Perfect Continuous Tense dan Past Future Perfect Tense memiliki arti yang sama (By yesterday I would have been finishing my homework: pada waktu kemarin saya akan telah menyelesaikan PR-ku) ini memiliki arti yang sama dengan (By yesterday I would have finished my homework: pada waktu kemarin saya telah akan menyelesaikan PR-ku)
Contoh lengkap Past Future Perfect Baca di sini

Rumus Past Future Perfect Continuous
Affirmative
Subject + would/ should + have + been + Verb-ing
I/ you/ they/ we/ he/she/my friend/it would have been studying in Italy
I/ we should have been studying in Italy
Negative
Subject + would/ should+ not + have + been + Verb-ing
I/ you/ they/ we/ he/she/my friend/it would not have been studying in Italy
I/ we should not have been studying in Italy
Interrogative
Would/ should + subject + have + been + Verb-ing
Would I/ you/ they/ we/ he/she/my friend/it have been studying in Italy?
Should I/ we have been studying in Italy?
Negative interrogative
Would/ should + not + subject + have + been + Verb-ing
Would not I/ you/ they/ we/ he/she/my friend/it have been studying in Italy?
Should not I/we have been studying in Rome?

Catatan:
Bentuk singkatan
I would                : I’d
You would           : You’d
We would            : We’d
They would          : They’d
He would            : He’d
She would           : She’d
Would not           : Wouldn’t
Should not          : Shouldn’t

Short Answer Question
Past Future
Perfect Continuous Tense
Question
Short Answer
Complete Answer
Would you have been studying in Madrid?

Yes I would
No, I would not
Yes I would have been studying in Madrid
No, I would not have been studying in Madrid
Would he have been studying in Madrid?

Yes he would
No, he would not
Yes he would have studying in Madrid
No, he would not have been studying