Re: "Won't" or "Wouldn't" ?
Both are correct but are used in different contexts:
You on the phone to your friend: "Usually, I leave the office at 5:30pm, but this evening I won't be able to get away until quite a bit later because I have a lot of work to finish."
You are still working at the same firm and are telling a story about what happened to you some time in the past: "Usually, I leave the office at 5:30pm, but this evening I would not be able to get away until quite a bit later; at 5:25 a man staggered into my office and collapsed!"
Edit to add lost paragraph line.
Last edited by PaulQ; 4th May 2013 at 12:26 AM.
"There are no rules in English, only guidance. Some guidance looks like a rule; it probably isn't."