Rule : A pronoun (or noun) in the possessive case should not be used as the antecedent to a relative pronoun.
Incorrect : India became dependent on his batting who scored runs with a passion.
Correct : India became dependent on the batting of him who scored runs with a passion.
Rule : The relative pronoun is sometimes wrongly omitted when it is the subject of a clause.
Incorrect : He has a resilience would see him through anything.
Correct : He has a resilience that would see him through anything.
Rule : The relative pronoun what is used without an antecedent.
Incorrect : I mean that what I say.
Correct: I mean what I say.
Rule : When the antecedent is the same, the consequent should be as or that; when the antecedent is such, the consequent should be as.
Incorrect : The book was such that he could read.
Correct : The book was such as he could read.
Rule : Pronoun of the third person plural should not be used as antecedent to who and that.
Incorrect : They who are students of the school need not buy tickets.
Correct : Those who are students of the school need not buy tickets.
7. Interrogative Pronouns : The pronouns used for asking questions are called Interrogative pronouns.
Rule : Which implies selection, that is it implies a question concerning a limited number. It is used of both persons and things.
Incorrect : What of the pictures do you like best?
Correct : Which of the pictures do you like best?