The document discusses different types of relative pronouns and clauses in English grammar including: - Defining and non-defining relative clauses using who, whom, whose, that, which - Possessive relative clauses using whose - Adverbial relative clauses using when, where, why - Special uses of relative pronouns like but - Cleft sentences which focus elements of a sentence by placing them after an "it" subject and form of be.

2. RELATIVE PRONOUNS (i) Which that  * * In Defining clauses the object relative pronoun can be omitted if it is not preceded by a preposition. Who(m) that  * * In Defining clauses the object relative pronoun can be omitted if it is not preceded by a preposition. Object Which that WHO that Subject Non person Person Ant Funct.