I'm writing one of my stories is present form. I've noticed that I switch between simple present, present perfect, present continuous, and present perfect continuous though-out the story within narration. However, I do stick to one of the four listed (present continuous) 70% of the time, and I was wondering if I could get any insight on tense switches. I mainly do these tense switches by starting a new paragraph or chapter, and sometimes within the same paragraph(which I do believe can be too confusing for the reader), but never within the same sentence. I guess I really don't have a question. I'm really just looking for insight -- as I have been studying past books read to receive further insight -- to edge out some discomforts that tediously eat at my mind. Also, I would like to point out "as" in this last sentence I wrote. I have not been able to form an opinion on my use of "as" in awkward cases: "I like football, as it is my favorite sport." And there are other instances where "as" sounds awkward, but, is still grammatically correct. I just can't seem to think of other awkward examples, as my mind has went way off track during this post.