A persuasive speech on a school rule, or a thing you want, or for school to allow phones during lunch or something like that.
Listing your ideas in order to generate a topic for your writing is called Brainstorming.
The theme of William Shakespeare's Sonnet 73 is the importance of the friend of the poet's loving him more strongly because of the temporal state of life. Calling attention to his aging in order to convince his lover of the urgency of full affection, the poet uses images such as "yellow leaves" and "twilight."
A technique of taking an audience back in time during the action of a play is called flashback.
My educated guess would be that "in an old bus" is the object of the preposition.