How do illustrations on 485 + 486 help understand what Greg is thinking?

Which tense allows for an event that began in the past to carry into the present moment in time

What response does lincoln hope to elicit from his listeners with these words from his gettysburg address "we gave to come dedicate a portion of that field, as a final resting place for those who here gave their lives, that that nation might live. it is altogether fitting and proper that we should do this

Ehat is the purpose of an arguement conclusion