Help me understand. . . .

[ChuckElias]

I'm bumping this from a few weeks ago b/c I have to teach lag time this week. So I'm still looking for a "bottom line" way to teach it.

Can we always put back exactly what we saw b/c of having definite knowledge? If not, how do we differentiate?

I hate the difference between seeing the clock as the whistle blows vs looking up after blowing the whistle. If I blow first and then look right away, do I have to assume that a second has already run off?

I would just like a simple answer to give to the new applicants.