1. I have blisters on my feet; I can't walk much further. -Why I made the changes: Blistering is a process, saying "I got" makes it sound like something that comes and goes quickly. 2. I'm very tired, I can't walk much further. -Why I made the changes: "I'm so tired, I can't walk much farther." This one is a bit tricky for me to explain. It would be okay if you are speaking to someone directly because you are able to embellish the pause between the two clauses; written, it reads a bit odd to me. It might be because of my French background and the need for "that" in place of the comma, I'm sure someone else will be able to give you a more grammatical response.