I wish to speak to the woman who prepared this report . A lawyer is the person whom you must see . Dr. Jenkins knows the man to whom the letter was addressed . He is a man whose actions speak louder than words . Commas should not be used to set it off from the rest of the sentence.
Adjective clauses introduced by that are always restrictive.
Henry designed a car that has won a prize . Adjective clauses are useful in combining two or more simple sentences into a complex sentence. We lost the track meet. It was held last Wednesday. We lost the track meet that was held last Wednesday .