The future perfect continuous is very similar to the future perfect. It is usually used to talk about an event that is ongoing or incomplete.
The future perfect continuous is formed using:
subject + will + have + been + present participle (+ing)
Remember, just like with the future perfect, these sentences must be used to make connections between two different events or instances. Again, we use time clauses or time phrases to separate the two events.
| Earlier Event | Later Event |
| Jenny will have been dancing ballet for twelve years | when her show happens next month. |
| They will have been napping for half an hour | when you come to babysit them. |
| The horses will have been training for six months | by the time the big race day arrives. |
| He'll have been waiting for two hours | by the time we get to the house. |
Usually, the future perfect continuous shows that the event is not finished.
| Future Perfect | We'll have met to exhange notes by the time school ends. She's giving me her notes in Math class. |
| Future Perfect Continuous | We'll have been meeting to exchange notes by the time school ends. I don't know how long it'll take for us to share all our notes. It could take hours! |
Exercise
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