A thesis statement focuses your ideas into one or two sentences. It should present the topic of your paper and also make a comment about your position in relation to the topic. Your thesis statement should tell your reader what the paper is about and also help guide your writing and keep your argument focused.
Some things means like a object or a person, you cant seem to put them in the past and maybe you have memories or bad memories with "it." So they dont belong in the past because thats your to remember.