The part of the sentence "three days remain" is correct and usable in written English.
You can use it when you want to refer to a time period - usually when you are counting down from a certain time towards a future point. For example, "We only have three days remain before we have to turn in the project."
Three days remain until Election Day, but Mitt Romney's campaign has suggested that Hurricane Sandy would be to blame for a possible defeat.
Only three days remain to form a new government by law.
Three days remain before the Knicks can officially sign players, but almost all of their off-season work is done.
Only three days remain for eligible players to demand a trade, and Chuck Knoblauch, one of those players, has not done so.
Only three days remain in this year's legislative session, and tenant advocates believe there is little chance the bill will come up for a vote next year, either, since lawmakers will be up for re-election and reluctant to displease real estate donors.
9 P.M. (MTV T.. I.'s ROAD TO REDEMPTION Three days remain in the finale of this reality series, which counts down to the rap star T. I.'s sentencing on gun charges and chronicles his attempt to complete 1,000 hours of community service before he returns to court.
With three days remaining in the season, the Yankees had begun to flirt with the worst disaster in baseball history.
The team had just three days remaining of two-a-days, but Edwards felt that after 35 practices, camp had lasted long enough...
Racing must end by next Tuesday and, with only three days remaining and more disruptions possible, the competitors may have to consider sailing two races each day.
Negotiations are stepped up after US Senator George Mitchell, the chairman, establishes an April 9 deadline for a peace agreement, but with only three days remaining the Ulster Unionists reject the draft deal.
TAIPEI, Taiwan, Dec. 8 - With three days remaining until legislative elections on Saturday, the streets here echo with slogans belted out from truck-mounted loudspeakers belonging to the Taiwan Solidarity Union, the smallest but fastest growing of Taiwan's main political parties.
