Future perfect continuous verbs: These are verbs that are happening in the future, however they are ongoing and are not completed.
An action happening before another future action:
"When you'll arrive, I will have been reading for two hours already."
Relationship between two future actions:
"I'm going to be really happy tomorrow because I will be visiting the downtown parade."
"By the time I retire, I will have been a teacher for over 50 years."
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