algojack, don't blame yourself. Even I, before I replied to your questions, had to think twice, before I could sort them out. Logic studies involve being careful and precise in language and in thought - that's what's good about it. And you are right in saying that people use modal qualifiers in somewhat mixed-up ways. E.g. we might say "People are sometimes very foolish," when we rather mean "some people are very foolish" or maybe both "some people are sometimes very foolish." Logic raises our awareness of the different possibilities of meaning and the possible errors. So, it is worth studying and practicing.
Something about you (optional) logician-philosopher
Thanks for the encouragement. I'll keep reading a few pages everyday and if there's something I'm struggling with I'll post my queries and hopefully you'll be able to clarify, as you already have. Cheers,