it's great to see what's left of you 请问后面的 what's left of you 为什么有is

问题描述:

it's great to see what's left of you 请问后面的 what's left of you 为什么有is

what's left of you 意思是“你留下了什么”,用be left是因为东西是被留下的,用被动语态~为什么加of啊?