My PPME about a month after my PPSE was on a foggy day in Long Beach. Fog in Long Beach usually burns off by 9 or 10 so we did the oral figuring the fog would burn off. When we went out, it was still there but the vis was good enough to see the other side of the field and you could tell it was not even 100' thick. Betty asked me what I wanted to do. I said, "How about we get out SVFR and do the air work, by the time that's done it looks like we should be rid of the fog." She agreed so that's what we did. When we got back to do the landings, though the visibility was reasonable with the end of the runway visible from the threshold, the beacon was still on designating IFR conditions in which you can't do a check ride (although I found there is exception to that on my IR ride which we completed with an approach through actual). So we came back in SVFR, she gave me a discontinuance and we did the landings the next day.