There is another way " I couldn't read a lot from this book" See , 동사+지 못하다 means can't, the " subject" might faced any interruption that made him incapable to continue the act " which is reading " There's a slight difference between 지 못 하다 and 동사+지 않다 The second is negative " I didn't " So if you would like to know the exact translation for it " I couldn't read more than this part from this book" However I think the first one make more sense as an English sentence Hope this was helpful ????