Future Perfect Continuous
1. Use of the Future Perfect Continuous
We use the future perfect continuous to say that will begin and will be happening at a certain point in the future. The continuous emphasises the duration, rather than the action
will + have + been + infinitive + ing
I will have been working here for 5 years in January.
4. Diagram to show usage of the Future Perfect Continuous
The emphasis is on the duration, not the action.