Identify the subordinate clause.
The book that I am reading concerns world population problems.
the book
the book that I am reading
book that I am reading
that I am reading
I am reading
concerns world population
this sentence contains no dependent clause
The book that I am reading concerns world population problems.
the book
the book that I am reading
book that I am reading
that I am reading
I am reading
concerns world population
this sentence contains no dependent clause