The part of the sentence "will be absent" is correct and usable in written English. You can use it to indicate that someone is not going to be present in a particular place. For example: "The professor will be absent from class today due to illness."
Who will be absent?
It will be absent for 18 months.
Several significant athletes will be absent.
The usual dominance will be absent, he predicted.
Should that happen, Ms. Burnett, at least, will be absent.
MacAnthony will be absent in the Bahamas today.
Still, I know some of his friends will be absent.
One holiday fixture will be absent this year.
What a shame that he will be absent next summer.
Two others -- Walter F. Mondale and Michael S. Dukakis -- will be absent, due to travel.
Both will be absent for their team's next fixture when Arsenal, fitness permitting, will retain Ospina.
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Cristina Valenza
Retail Lead Linguist @ Apple Inc.