MALE STUDENT: Does... mm, do scientists actually know about sauropods, from looking-I mean, how much can we actually learn, looking at some ancient bones...compared to all we can learn from modern animals?

MALE STUDENT: And comparisons between animals that lived millions of years apart-w-well, it just seems...more like guessing.

FEMALE PROFESSOR: There's always some guesswork when studying extinct animals.

PROFESSOR: But that's exactly what leads to discoveries: A hypothesis-a type of "guess"-is made...we "test" the hypothesis, by looking for evidence to support it...

第一个问题：这种there's .... + 分词结构，是悬垂结构吗？

FEMALE STUDENT: Didn't really think about it.It looked exactly like mine, uh, which is inspiring, in a way, knowing my violin could also produce such beautiful tones, that maybe I'll sound that good someday.

MALE PROFESSOR: I hope you do. But if your violin isn't as good as his...

FEMALE STUDENT: You mean he might not sound as good playing my violin?

MALE PROFESSOR: As I said, tone quality differs from instrument to instrument.The question is...why?

第二个问题，请问老师，这里的playIng my violin是现在分词做时间状语, 因为playing逻辑主语应与句中主语he相一致, 那么这里的you mean可以不看的吧？