Assuming something is true:
* I presume you've already eaten lunch.
* We presume the meeting will start on time.
* I presume you know how to use this software.
Taking on a responsibility:
* I presume the role of team leader in this project.
* He presumed the position of CEO after the previous one retired.
Believing something is true without proof:
* I presume you're right, but I'd like to see some evidence.
* It's dangerous to presume guilt without a trial.
Using "presume" with "to be":
* I presume her to be a doctor.
* They presumed him to be innocent.
Other uses:
* The defendant presumed on the judge's leniency. (To take advantage of)
* He presumed to speak for the entire group. (To act as if you have the right to do something)
The meaning of "presume" can vary depending on the context. It's important to consider the surrounding words to understand the intended meaning.