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 correct answer is: that I am reading

A subordinate clause ( a dependent clause ) begins with a subordinate conjunction (as, if, than, that, where, until etc) or a relative pronoun (that, who, whom etc.) and will have a subject and a verb. This clause can not stand alone as a sentence because it does not provide a complete thought.

that I am reading is a subordinate clause because it contains a relative pronoun that introduces it ( that ), a subject ( I ) and a verb ( am reading ). It can not stand on its own because it does not have any meaning.

- "a nonrestrictive clause functions as a modifier to a noun (that is an object, person or concept). these clauses can be described by the following three options: it is set off by comas, it contains a subject and a verbs and it adds nonessential information to the sentence.

for example, in "here is bill gates, who confounded microsoft software company" we can identify "who confounded microsoft software company" as a nonrestrictive clause modifying the noun bill gates. this clause can be describes as a nonrestrictive clause because it is separated by a comma, it adds nonessential information to identify who bill gates is and it must contain both a subject (who) and a verb (confounded)."

in ray bradbury's short story "a sound of thunder", mr. eckels's fearfulness leads to drastic consequences for the rest of the world.

in the story, mr. eckels, who is a hunter, hires a time travel company to travel to the age of dinosaurs. although he is excited for the hunting expedition at the beginning, when they reach there and mr. eckels sees the tyrannosaurus, he feels frightened. as he is afraid of the tyrannosaurus, he steps off the path although he has been warned not to do it. by stepping off the path, the entire course of the future is affected: mr. eckart alters the future by stepping on a butterfly, which causes a new man to be elected president in the future. in that way, it is mr. eckart's fearfulness what triggers 'the butterfly effect' and what leads to drastic consequences for the rest of the world.