Do you make marks while reading?

Are you talking about textbooks, lixiaos? I think it would be fine to make notes in books you were using for study (if you owned them, of course!) but not in novels - I can't see why you'd need to do that! I used to borrow books from the library, and sometimes people had written in them - it was a bit weird!

It depends what sort of book I'm reading. I will mark in my academic books, but it is rare that I mark in the ones I read for pleasure.

Hmmm.... I don't. I'm very particular with my books and I don't put any creases or markings on it. I think of my books as priceless things. I even cover them so that they won't get dusty. If there is a paragraph that I like, I'd write it down in my notebook instead of putting a mark.

same here. I sometimes use stabillo boss for highlighting good quotations, remarks, values on that book that I am reading. If I just borrowed the book, I wrote that on a piece of paper and store it into my computer.

sometimes I do sometimes don't. it's depend on how important that lines to me. if I think it's important I usually mark on it. so I'm not loosing the point for another day. because if I separated it --my notes-- to another place or book, sometimes I got forgotten where I got it :)