He is either drunk or mad.
It’s either your fault or her fault.
Either you are wrong or I am.
A: Do you have the report you promised me?
B: What report?
A: You know, your work report.
B: Either you’re kidding me or I’m getting forgetful in my old age.
A: I think it’s the latter.
B: I’m sorry. I’ll hand it in tomorrow.