Mari, your challenge fascinate me. I thought tenses were fairly limited to past, present, and future.
Now, "modes" come to me, alien as E.T. I know of median, mean, and mode from statistics. Are these grammar modes taught above the tenth grade? (I was expelled during my tenth grade.)
I just tried "modes" in a search string, and got results in terms of math, music, and machinery. If grammar modes was in that results dump, they were so far down as to be gone.
Thank you for bearing with me.
"The avalanche has started. It is too late for the pebbles to vote." -Ambassador Kosh Naranek