There are ten errors in the use of punctuation marks in the following text. Rewrite the text correcting the errors: — 

Student : Excuse me sir. May I come in? 

Teacher : Yes come in. 

Student : Thank you sir. 

Teacher : What can I do for you. 

Student : Would you kindly make me clear about the use of this punctuation mark. 

Teacher : Didnt you attend my class yesterday? 

Student : No sir. I did not comE- 

Teacher : Why? You must not miss any class. 

Student : Ill never miss any class sir.