After the exam., one student asked his English teacher, 
   'Sir, can I pass this English course ? '
     
His englished answered :
   'Y.M.C.A.'  
The student asked : what does 'Y.M.C.A.' mean ?
The Englished replied : You Must Come Again.  

 
Note : YMCA is a institution which means 
       Young Men's Christian Association.