Future Perfect Continuous Tense

We use the Future Perfect Continuous Tense to talk about a future event that will be in progress when another future event occurs. The Future Perfect Continuous Tense emphasises the duration of the first (1st) event. The first (1st) event can start in the past or future. The second (2nd) event must be in the future.


             #--------------------
             |                    
<----now-----+----------------2nd---------->
             | 	             event   
             #--------------------
             /
        1st event

I will have been working for 2 hours when you arrive.

I start work at 4:00pm. You arrive at 6:00pm. I will work for 2 hours before you arrive. 1st event= I am working. 2nd event= you arrive (2 hours after I start work).

She will have been living in France for 2 years when she leaves.

She is planning to leave France in the future. She will leave France 2 years after she arrived.
We use the Future Perfect Continuous Tense for the first (1st) event. We use the Present Simple Tense for the second (2nd) event.

Making the Future Perfect Continuous Tense

+ I will have been working for 2 hours when you arrive. s=‘I’ + will + have + been + ving=‘working’

- I won’t have been working for 2 hours when you arrive. s=‘I’ + will + not + have + been + ving=‘working’

? Will I have been working for 2 hours when you arrive? will + s=‘I’ + have + been + ving=‘working’

The short form of ‘will not’ is ‘won’t’.
‘Have’ does not change with the subject in the Future Perfect Continuous Tense. We always use the base form of the verb with ‘will’.

Pronunciation

I will have been working for 2 hours when you arrive.

I won’t have been working for 2 hours when you arrive.

Will I have been working for 2 hours when you arrive?