The phrase "almost invariably know" is correct and usable in written English.
It can be used to indicate that something is true in nearly all cases or situations, suggesting a high degree of certainty.
Example: "Experts in the field almost invariably know the latest developments and trends that affect their industry."
Alternatives: "typically know" or "generally know".
It was the news anchor John Roland who proclaimed Mr. Mazer the Amazin' after Mr. Roland started tossing him arcane sports questions during the broadcasts, and Mr. Mazer almost invariably knew the answers.
As long ago as the mid-nineteen-thirties, a special group of hydrocarbons, the chlorinated naphthalenes, had been found to cause hepatitis and a rare and almost invariably fatal disease known as yellow atrophy of the liver in persons subjected to occupational exposure.
Almost invariably, they want to know why a man they know to be decent, thoughtful and funny -- they always say funny -- is so often drawn as not even quite human.
People who know him almost invariably mention his fatherly demeanor, and his gift for teaching.
"Our time is oriented to the loser," Heston wrote in his diaries in 1965, and though he had, up to that time, almost invariably played winners, he seemed to know in his actor's bones that the true riches were to be found playing the sorts of antiheroes then dominating the movies.
But as anyone with a cellular phone knows, wireless subscribers almost invariably pay for incoming as well as outgoing calls.
I should add that ungenerous leaders I have known have been almost invariably unable to trust, even when they are at the helm of organizations in which trust is wholly warranted.
If they know them individually, they almost invariably like them.
I know some mathematical types (almost invariably youngish and male) far more interested than me in the more arcane art of preference flows have done the calculations.
So too are her "customers" (who used to be known as "clients", and are almost invariably women).
