However, "presumptuous" is an adjective, not a verb. So, you would use "presumed" in a sentence like:
* "He was presumptuous in assuming he knew what I wanted."
* "She presumed that her opinion was the only one that mattered."
You might also use the past participle of "presume," which is also "presumed," in a sentence like:
* "He had presumed too much about the situation."
Let me know if you'd like more examples or have other questions!