The phrase "acknowledge that it will" is correct and usable in written English.
You can use it when you want to express recognition or acceptance of a future event or situation.
Example: "We must acknowledge that it will take time to see the results of our efforts."
Alternatives: "recognize that it will" or "accept that it will".
Mr. Zaremba and other ethanol advocates acknowledge that it will be difficult to persuade motorists to fill up with E15.
But even the Arrow's most enthusiastic advocates acknowledge that it will not provide Israel with an impenetrable shield.
American and Pakistani officials acknowledge that it will take several years to build the Frontier Corps into an effective counterinsurgency.
That state, with its growing Hispanic population, is a prime target for the campaign to win again in 2012, though advisers acknowledge that it will be harder.
Executives are seriously discussing extending the show to a sixth season, though they acknowledge that it will entirely depend on the decision of the show's creator, David Chase.
Hedegaard's manoeuvring also forced China to acknowledge that it will take on commitments on an equal legal footing to developed countries.
She acknowledges that "it will be said … that the demand for love made in this book is a tall order, and unrealistic given the present state of politics".
He acknowledged that "it will be very important" to get a good result in São Paulo, the final road race before the series goes to the Indianapolis 500.
Amanda said she joined only two other societies (national and English) so as not to overextend, but acknowledged that "it will be kind of hard in May when I'll have three honor cords and everyone else will have nine".
Once you've moved past the initial shock, it'll be less intimidating to tell the other person but it's important to acknowledge that it'll still be hard, so don't feel that you have to be "perfectly resolved" before talking to them; if the bad news also affects you, that is unrealistic to even attempt.
Deutsche Telekom, Europe's biggest telecommunications company, has acknowledged that it will not reduce its debt as quickly as it had promised and has begun bracing for another reduction in its credit ratings.
