Sitting dear chap, sitting. Tsk.
If you had previously sat on the fence then indeed you sat there but if you are currently doing so then I'm afraid you are, without question, sitting. If you cease to sit and recall the act of sitting then of course you could describe your erstwhile activity as having sat.
There, I do hope that is now clear? However, if you have any questions, please do not hesitate to ask.
;-)
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