The phrase "almost sure that" is correct and usable in written English.
It can be used when expressing a high degree of confidence about something, but not complete certainty.
Example: "I am almost sure that the meeting is scheduled for tomorrow."
Alternatives: "fairly certain that" or "pretty sure that".
"We're almost sure that we're going to have to end up going door to door," she said.
Lara was almost sure that one of them was the man in the black coat, from the bus.
Only here are you almost sure that you are careering on top of a big shiny globe, blurrily spinning … Can you see this motherfucking sky?
How many people would you think would have to be in a room that your odds would be almost sure that they would have exactly the same birthday on the same day?
American officials say it is almost sure that a new, smaller force of NATO troops, including some Americans, will be deployed after Dec. 14 with a new mandate, to insure that Bosnia does not return to open warfare.
Coming to an end of a book can be a dark time for Garner, but he is upbeat today, even though he is almost sure that Boneland will be his last work.
It was the change in the weather that changed everything she was almost sure of that.
It was the change in the weather that changed everything — she was almost sure of that.
Extreme violence permeates the lives of people in San Pedro Sula and Ciudad Juárez and once we understand that, we can begin to comprehend why so many thousands of women and children prefer the risk of fleeing to the almost sure death that awaits them if they stay.
As 2017 slowly cruises into full gear, it is normal for individuals and brands to settle down and make preparations that are almost sure to guarantee that 2017 turns out a greater year than 2016 was.
Such are the ways of Albany that when things seem to be proceeding in an orderly, democratic fashion it is an almost sure bet that they are about to spin out of control.
