- I use the same books that my sister used. vs 2. I use the books that my sister used.
I think the no.1 sentence is ambiguous: the same kind(sister didn't use) or the identical books(sister used)
I also think the no.2 sentence is less ambiguous than the no.1: no2 gives me the impression that 'the books that my sister used' means 'the very books that my sister used and I inherited the books from my sister'.
What's the difference between the two sentences or what are their meanings?