Re: Wiring a switch/outlet combo
It appears that the "electrician" (and I use that term loosely here) used the bare ground wire as the neutral in the circuit.
There is no way to safely install an outlet in this box without running new wire.
Based on the level of expertise demonstrated by your question, I can only recommend you call a licensed electrician.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.