Ohad knew he had a few hours before they will open a wormhole to Mumbo Booboo. Or Ohad knew he had a few hours before they would open a wormhole to Mumbo Booboo.
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Before does odd things to tenses. Would is okay, but implies the event is susceptible to being changed. Better would be to just drop will from the first sentence. You can also use the past tense after before. "Ohad knew he had a few hours before they opened a wormhole to Mumbo Booboo. That is probably the most common way to phrase it.– Phil SweetJul 14, 2018 at 0:09
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It was your duty to post explanations of each option and another for your prospective conclusion. How would you justify “Ohad knew he had a few hours before they will (anything)…”? Neither "before" nor many "odd things" matter here.– Robbie GoodwinAug 1, 2018 at 21:23
2 Answers
"Ohad knew he had a few hours before they would open a wormhole to Mumbo Booboo."
The sentence describes events taking place in the past. The "would" acts as the simple past of will here.
https://www.dictionary.com/browse/would?s=t
As @Phil Sweet commented, "Ohad knew he had a few hours before they opened a wormhole to Mumbo Booboo" would be more common.
Ohad knew he had a few hours before they open a wormhole to Mumbo Booboo
That's English subjunctive mood as in "I ask you leave now".