The book which I read is on the desk. 先行詞The book用關係子句 which I read修飾,關係子句(I read)接在先行詞book後修飾關係代名詞。請問這句是否 應改為關代+子句修飾先行詞.?

The book on the desk "in which" I read
---(in which I read)----relative cl.---(on the desk) prep phrase-------the adjective clause distingusihes the book from other books, otherwise not clear if and do not needs any commas---a defining clause
or:-eg:-Re:-Posting:-
I read the book(which) is lying on the desk.
--------------book<------(which)-------
which is the relative pronoun as the subject of the verb "is" in the clause ,and refers to the antecedent "book".

The book which I read is on the desk.
which就是「關係代名詞」，除了帶出關係子句，表示子句和先行詞的關係是「限定性質的修飾語」，同時它在關係子句裡當動詞read的「受詞」。