Past Future Prefect Continuous tense

Tense ini digunakan untuk menyatakan suatu peristiwa, kejadian atau tindakan yang waktunya sudah sedang berlangsung, dan masih akan berlanjut di waktu lampau.
a. Pola Baku
I/We + Should + Have + Been + Present Participle
He/She/It/You/They + Would + Have + Been + Present Participle
1. Positive Sentence atau Kalimat Positif
S+ Should/Would + Have + Been + V-ing + O/Adv
Contohnya :
* We should have been watching television by last night.
* She would have been playing tennis by last Sunday.
2. Negative Sentence atau Kalimat Negatif
S+ Should/Would + Not + Have + Been + V-ing + O/Adv
Contohnya :
* We should not have been watching television by last night.
* She would not have been playing tennis by last Sunday.
3. Interrogative Sentence atau Kalimat Pertanyaan
Should/Would + S + Have + Been + V-ing + O/Adv?
Should/Would + Not + S + Have + Been + V-ing + O/Adv?
Contohnya :
* Should we have been watching television by last night?
* Would not she have been playing tennis?
b. Penggunaan
1. Untuk menyatakan suatu kejadian atau peristiwa yang seharusnya sedang berlangsung selama jangka waktu tertentu di masa lampau.
Contohnya :
* We should have been staying here for six days by yesterday.
c. Ciri-ciri Khusus
1. Predikat kalimat yang lazim dipakai dalam bentuk ini berupa : Should/Would + Have + Been + Present Participle.
2. Kata “have” tidak mengalami perubahan walaupun kalimat tersebut menunjukkan kalimat ketiga tunggal. Dan setelah kata “have” diikuti oleh kata “been” yang berarti “sudah sedang”.
3. Keterangan waktu yang sering dipergunakan dalam tenses bentuk ini adalah :
By last… : menjelang akhir
By the end of….. : menjelang akhir
By…. last year : menjelang…. tahun lalu