she's reading the book under the tree关于介词短语这里的 under the tree 是修饰the book 还是 is 状态?如果要表达她正在看那本在树下的书,怎么说?

she's reading the book under the tree关于介词短语这里的 under the tree 是修饰the book 还是 is 状态?如果要表达她正在看那本在树下的书,怎么说?
she's reading the book under the tree关于介词短语
这里的 under the tree 是修饰the book 还是 is 状态?
如果要表达她正在看那本在树下的书,怎么说?

she's reading the book under the tree关于介词短语这里的 under the tree 是修饰the book 还是 is 状态?如果要表达她正在看那本在树下的书,怎么说?
怎么可能修饰 book 呢,她在树下读书,很合逻辑；她在读树下的书,不合逻辑.书应该在她的手里才对啊.她在树下,书在她手里,她不在树下怎么读树下的书?
硬要那样说也行：She is reading the book which was found under the tree.

she's reading the book that is under the tree.

she's reading the book which is under the tree.
这里的有歧义。

under the tree 是修饰the book
she's reading the book which is under the tree.

under the tree 说明的是“她看书'所处的地点
she's reading the book which/that is under the tree.

under the tree 是整句的地点状语
如果要表达她正在看那本在树下的书，怎么说？
可以说：she's reading a book titled “under the tree”

under the tree 是说明她看书的地点
she's reading the book that is under the tree