My question for Question Day. This is for Cillaliz.
Please explain the tenses of "to plea."
[pedantic mode ON]
Can't do it. "Plea" is a noun, and hence has no tense. The verb "plead," on the other hand...
[pedantic mode OFF]
Now, if you want to get involved in the "pled" vs. "plead" (pronounced "pled") vs. "pleaded" discussion, that's another story. Hie thee to your local copy of the OED, if you so desire.
(as an aside, anybody interested in the kind of minutiae that the OED specializes in MUST read "The Professor and the Madman")