This is Mr.John 这是 Mr.John (后面补充说明是哪个)
for whose son I brought a book yesterday.
先将主语找出来:I brought a book for whose son yesterday.昨天我买一本书给那个人的儿子.
合起来是:这是昨天我买一本书给他的儿子的John先生.
This is Mr.John 这是 Mr.John (后面补充说明是哪个)
for whose son I brought a book yesterday.
先将主语找出来:I brought a book for whose son yesterday.昨天我买一本书给那个人的儿子.
合起来是:这是昨天我买一本书给他的儿子的John先生.