presumably
adv.used to say that you think something is true, even if you are not 100% sure. You use it when you have a good reason to believe something based on what you already know.
adv.used to convey that a statement is very likely true based on the available evidence, though not definitively proven.
“The store is closed, so presumably they have gone home.”
“The flight was delayed for three hours, so presumably the passengers will be eligible for a refund.”
“The artifacts were found deep within the cave system, presumably left there by early inhabitants seeking shelter from the harsh glacial climate of the era.”
Sentence adverb — typically placed at the beginning of a clause or before the main verb to indicate the speaker's degree of certainty.
Presumably is an adverb and cannot function as an adjective following 'it is'; use 'it is probable' or 'presumably' as a sentence modifier.
Usage presumably reflect
“Presumably, the essential point here is what kind of things they do in their screen time.”
“It would presumably need to be made of lead or other high-density materials that would add mass and make moving around nearly impossible.”
Common in culture writing