关于which的英语语法popular music is what teenagers like ,is后面可以加which吗 The book iswhich on the desk和 the book which is on the desk两句语法都对吗?

不可以
第一句错，第二句对

popular music is what teenagers like ,is后面可以加which吗
不可以.这里what引导的是表语从句,已经完整了.
流行音乐是青少年喜欢的.
The book is which on the desk和 the book which is on the desk两句语法都对吗?
The book is which on the desk这句不对,不能加which
the book which is on the desk这不是句子
改为
The book which is on the desk is mine就对了.