Why does Antonio agree to help Sebastian

The excerpt is from a longer essay on huckleberry finn by mark twain. what kind of support is used to develop the writer's main idea regarding how twain brought his characters to life?

Key events - what happens? what do we learn about the character in this event? or how does the event change the character? what is the author’s message in each set of events you have identified? 1.bruno and his family move from berlin to auschwitz due to the move he learns of the camp which leads to another key event. 2.bruno meets shmuel when they meet, they become friends which in turn towards the end leads to their untimely demise.

Iwill have sailed around the world by the end of next year. what is the verb form in the sentence? future perfect past emphatic present progressive past perfect