Meaning of What happen
Bangla: কি হল
Unknown / অজানা / अज्ञात
(used interrogatively as a request for specific information): What is the matter?
(used interrogatively to inquire about the character, occupation, etc., of a person): What does he do?
(used interrogatively to inquire as to the origin, identity, etc., of something): What are those birds?
(used interrogatively to inquire as to the worth, usefulness, force, or importance of something): What is wealth without friends?
(used interrogatively to request a repetition of words or information not fully understood, usually used in elliptical constructions): You need what?