and you have to build up  you ha you would imagine that would require you , you know , to be very specific about the machinery , whereas past is a very conventionalized one and we sort of know what it means but it  we doesn't  don't necessarily want to , you know , unload all the notation every time we see that it 's past tense.
Right.
So , you know , we could think of our  uh , just like X - schema " walk " refers to this complicated structure , past refers to , you know , a certain configuration of this thing with respect to it.
I think that 's exactly right.