Future
By 2060, we ........ (find) a cure for all illnesses. I am so sure about it!
(action completed by that time)
By 2060, we will have found a cure.
By 2060, we ..... (stop) using mobile phones. No more mobile phones after 2060.
We will have stopped using mobile phones.
By 2060, polar bears _________ (become) extinct. No more bears after 2060.
Polar bears will have become extinct.