When we find (time + se, raha hounga, rhi houngi, rhe honge) at the end any Hindi sentence, we call them future perfect continuous tense and as a helping or auxiliary verb we use /will have been + V1 + ing ), and to describe (time se) we use for or since.
Affirmative Sentence Structure
Subject + will have been + V1_ing + for/since + time duration/exact time.
Negative Sentence Structure
Subject + will have NOT been + V1_ing + for/since + time duration/exact time.
Interrogative Sentence Structure
when sentences start with KYA
Will + Subject + have been + V1_ing + for/since + time duration/exact time?
WH + Will + Subject + have been + V1_ing + for/since + time duration/exact time?
Interrogative & Negative Sentence Structure
when sentences start with KYA
Will + Subject + have NOT been + V1_ing + for/since + time duration/exact time?
WH + Will + Subject + have NOT been + V1_ing + for/since + time duration/exact time?