Introgative pronoun
                       A pronoun which used to make a question is known as an introgative pronoun.
Examples: Who, whose, which, whom,what.
1)Who:
It is used only for persons in subjective case.
Examples:
*Who was the first prime minister of Pakistan?
*Who is known as the father of the nation?
2)Whom:
     It is used for persons in objective case.
Examples:
*Whom do you want to see?
3)Whose:
  It is used in possessive case.
Examples:
*Whose are theses 📚?.
*Whose hand-writing is this? 
4)Which:
  It is used both for persons and things.
Examples:
*Which is the longest river of Pakistan?
*Which is the highest peek of mountain in Pakistan?
5)What:
   It is used for things.
Examples:
*What  have you.                                                                                                                                        *what is happinig today.          
 6) What are you and who are you:
                       ' what are you'    refers to your proffession and ' who are you 'refers to your name and other particulars. 
Example:
*What is he? He is lawyer.                                 *who is he? She is daughter of naeem. 
7) What +be+like
    It is used to make a request for a description. 
Example:
*What is the day like? The day is very hot. 
*What is he like? He is clever and handsome with pleasant manner. 
8) What does he /she/it look like:
       It is used to talk about physical appearance. 
Example:
*what does your son like? He looks like a doctor. 
9) What +for
It is used in the sense of why. 
Examples:
*What are you doing it for? [It means: Why are you doing it? ]
                                                   
 
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