Jack said that he was working. However, if the 'he' is not clear, a name would be better. Otherwise, without context, it could be interpreted to say that Jack wasn't working, and I don't think that's the case here.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
tenjingActually my question was,Jack said,"I was working".Ah. Well, that's very different from your original question.