Question

He has two sons, both of whom are teachers.

He has two sons, both of whom are teachers.从句缺主语，但whom只能代宾语啊，为什么还要用whom啊？

Answer 1

of 是介词，后面用宾格，即whom

追问

意思是both of whom整体构成主语吗？

追答

是的

追问

谢谢，我懂了