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You're editing a dramatic script for a popular soap opera. Select ALL the lines that correctly use the Future Perfect Continuous tense without breaking the grammatical rules of stative verbs!
The correct answers are By the time the truth comes out, they will have been secretly dating for a decade! and When the wedding finally happens, she will have been hiding her true identity for months.
The Future Perfect Continuous is perfect for emphasizing the duration of an ongoing, dynamic action before another event in the future ("dating" and "hiding").
However, stative verbs—verbs that describe states of being, possession, or cognition (like know and be)—cannot generally be used in continuous tenses. Instead, you must use the Future Perfect Simple: "he will have known" and "they will have been in love".