You may try to find out which the book you want (be)WANT 后面应该填什么,为什么
问题描述：
You may try to find out which the book you want (be)
WANT 后面应该填什么,为什么
答
to be 有这么一个词组的嘛（want to do）
答
You may try to find out which the book you want (be)
You may try to find out which book you want TO READ
首先, 是which book 不是which the book
再次,want 后面 加 to read
答
应该填 is
which the book you want is是一个宾语从句
如果把它变成单独的一个句子就是:
Which is the book you want?
所以原句只不过是把这个句子变成了陈述句语序,所以把is 放到了后面