Final answer:
Relative pronouns, such as who, whom, which, what, whose, and whoever introduce clauses. They link phrases and clauses together, offering necessary context within sentences. The relative pronoun used depends on whether it is the subject or the object in the clause.
Step-by-step explanation:
The pronouns that introduce clauses are known as relative pronouns. The most common relative pronouns are who, whom, which, what, whose, and whoever. These pronouns are used to link phrases and clauses, providing important context and clarity within our sentences. For example, in the sentence 'The student, who studied all night, aced the test', 'who' is a relative pronoun introducing the clause 'who studied all night'.
Relative pronouns can introduce a number of different types of clauses. They can introduce adjective clauses (e.g., 'I don't know the person who left this here'), or noun clauses (e.g., 'Whoever left this here must come back to get it').
The usage of 'who' or 'whom' is dependent on whether the pronoun is functioning as the subject or object of the clause. 'Who' is used when the pronoun is the subject, and 'whom' when it is the object.
Learn more about Relative Pronouns