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I presume that she will arrive on time for the meeting.
Presume is an action. Therefore the word is already a verb.Presumes, presuming and presumed are other verbs, depending on the tense.
I presume that you were talking about Presume. Not persume , as it is incorrect.
Even though she knew him well, she did not want to presume how he felt about the situation. Presume is a verb.
I presume that the word "presume" is a verb.