Answer:
I wont explain my personal experiences, but here are some ideas for you:
You might've left home for a sleepover, a field trip, or a vacation.
Answer:
Dear, (Name)
I have heard that you have been diagnosed with dengue fever. I hope you get well soon. I can't wait for you to come back and play with you.
Your Classmate, (Your name)
The attack on fort Sumter is the unofficial start to the war, but the conflict began far before with sectional tension coming to a head over slavery resulting in the south's secession. The first official battle was the one fought at bull run