Cover Letter

I know this sounds really odd, but I was stuck writing the cover letter a couple hours ago. I don’t usually think about my writing process, so I didn’t know to start at first. I am not sure if splitting my original thesis into 2-3 sentences work, because I thought it didn’t really sound the same. And When I talk about how I have accomplished the purpose of my essay, my answer spills over and answers the the question about how the structure facilitate the development of my idea. Did anyone else have that problem?