We've got future perfect continuous passive which is just ridiculous i will have been being listened to for 10 years and let's be honest no one ever really says this okay it's something that you can say in grammar but no one ever does. We often use will with certain verbs so imagine i will becomes all i'll have been doing, i'll havebeen doing this for 15 years at the very least. So the O and OV become love. It sounds like I love, I love, doesn't it? It does sound like that. Now if you are a new learner of English, I would forgive you if you thought I said I love doing this  it might sound like