apakah rumus dari past future perfect continuous tense(ps.f.pf.c)?

Past Future Perfect Continuous Tense.

positif (+)
S + would + have + been + V1-ing/present participle

negatif
S + would + not+ have + been + V1-ing/present participle

tanya
would + s+ have + been + V1-ing/present participle

S+would+have+been+V1-ing

Semoga membantu