I’m assuming this is the very friend of whom you spoke, Harry?
However, let us assume that you have invited me warmly into your house.
Shall we assume that you have invited me into your sitting room?
"Well, I assume so, as Longbottom was there," said Zabini indifferently.
He hoped very much that they would all assume he had been involved in something heroic, preferably involving a couple of Death Eaters and a dementor.
"I would assume that you were going to offer me refreshment," Dumbledore said to Uncle Vernon, "but the evidence so far suggests that that would be optimistic to the point of foolishness."
He threw the package across on to Ron’s bed, where it joined a small pile of them that must, Harry assumed, have been delivered by house-elves in the night.
"I assume that Dumbledore has discussed these matters with you?", Harry deliberated, wondering whether he ought to lie or not.
Harry could only assume that it was down in Hokey’s contract that she must lie through her teeth when asked this question, because Hepzibah Smith looked a long way from lovely in his opinion.
… I just assumed that he was in a hurry to chase after the Death Eaters who’d escaped up to the tower.
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I believe that it was then that he dropped the name forever, assumed the identity of Lord Volde-mort, and began his investigations into his previously despised mother’s family — the woman whom, you will remember, he had thought could not be a witch if she had succumbed to the shameful human weakness of death.
The remaining two, assuming again that he created a total of six, are more of a problem, but I will hazard a guess that, having secured objects from Hufflepuff and Slytherin, he set out to track down objects owned by Gryffindor or Ravenclaw.
For a moment he could not find Malfoy anywhere and assumed he must indeed be inside the Room of Requirement again, but then he saw Malfoy’s tiny, labeled dot standing in a boys’ bathroom on the floor below, accompanied, not by Crabbe or Goyle, but by Moaning Myrtle.
’… which means, of course, that assuming we have achieved correct identification of the potion’s ingredients by Scarpin’s Revelaspell, our primary aim is not the relatively simple one of selecting antidotes to those ingredients in and of themselves, but to find that added component which will, by an almost alchemical process, transform these disparate elements —’ Ron was sitting beside Harry with his mouth half-open, doodling absently on his new copy of Advanced Potion-Making.
"The Dark Lord has used Inferi in the past," said Snape, "which means you would be well-advised to assume he might use them again.
Ir seems almost foolish to ask," said Slughorn, who was looking mightily impressed, "but I assume you know what it does?"