The phrase "assuming him" is not correct and does not convey a clear meaning in written English.
It may be intended to express a condition or belief about someone, but it lacks clarity and context.
Example: "Assuming him to be the leader of the group, we followed his directions."
Alternatives: "considering him" or "regarding him as".
At once, we take Connie's side, assuming him to be his brother's keeper.
At my launch party, I effusively greet a man in a grey suit, assuming him to be a TV producer (everyone else is in khaki casual).
Let's not forget that we already suffer the effects of the weakness of information collection via conventional means, as was the case in Afghanistan when bin Laden left recordings of himself broadcasting from caves, fooling commanders into assuming him present.
For all their clamour to seal the deal – rumour has it they jeopardised a Madonna album in order to secure his signature – WEA never quite knew what to do with Rae, assuming him to be a kind of novelty act and not an artist who wished desperately to be taken seriously.
Ann and Mark return from their date and call the police after they see him, assuming him to be a prowler.
He wore long, shiny hair under a silly Fedora and I eyed him suspiciously, prematurely assuming him to be a less-than-serious antique shopper.
Though there is no hard evidence of David's presence, the context today fully assumes him.
It no longer strikes me -- and I assume him -- as such a swell idea.
He tells his family that if he hasn't returned within 10 days to assume him dead.
Was Hobsbawm really the dangerous communist, the Stalinist apologist, the unrepentantly hardline Marxist that so many have assumed him to be?
Others of my ilk, seeing the name transliterated as Kim Jong Il, assume him to be the son of Kim Jong I, which he is not.
