Must ask questions on a for sale by owner property

[Belliny Flores]

Good afternoon BP family!  I've run across a couple of properties that I'm going to be making phone calls on.  I was hoping some of you experts out there can help me come up with a list of questions that should be asked when inquiring about an owners property besides the obvious.  These properties are for sale by owner and I was going to be asking the basics like what kinds of repairs, and inquire about their situation and why they're selling and how soon etc.  But is there a question that is off the radar for a newbie like me that should definitely be asked?  Thanks in advanced for all your input.