What is the formula for Past Perfect Tense. Share with your friends Share 0 Sutapa Chattaraj answered this This topic has already been explained on your Study material. Kindly follow the link given below: https://www.meritnation.com/cbse/class7/studymaterial/english/english-grammar/tenses/30_435_1629#slide6_the-perfect-tense 0 View Full Answer Aditi Ramadas answered this Past Perfect Continuous Tense S + had been + V + ing + O + since/for E.g. We had been writing a letter since morning. 0 Mansi answered this the past tense of the verb to have (had) + the past participle of the main verb. 1