When I was in high school I would always mess up between past tense and present tense words. For example, “in new york city there are (currently) many home teams, going (present) to the Knicks game is (present) something I always look forward to.” then later on saying “my cousins and I went(past) all the time.” This is something I would always get corrected on by my English teachers because I would often mix up past and present-tense words. I would also mess up when I would write “yours” and “you’re” and “theirs” and “there”. I would also mess up comma placements because I wouldn’t know if it came before transitions or after.