In a certain language CLOUD is written as GTRKF. How SIGHT written in this language?

In a certain code language, "CASIO"  is written as "3119915". How is "CITIZEN" written in that code language? 

In a coded language ‘STAY’ is coded to ‘19403100’ then how ‘HOUR’ will be coded?

In a certain code, DEAF is written as 3587 and FILE is written as 7465. How is IDEAL written in that  code?

In a certain code language, 'RESTRICT' is written as 'CTRISTRE', 'STARTING' is written as 'NGTIARST' and 'MOUNTAIN' is written as 'INTAUNMO'. What is the code for the word 'ENVELOPE' in that code language?

If “HACB” is written as “8132” in a certain language. Then how “DEFA” is coded.

If ADVANCE is coded as CEWCXMG, then what will be code for BRITAIN?

If 'dust' is called 'air' , 'air' is called 'fire' , 'fire' is called 'water' , 'water' is called 'colour' , 'colour' is called 'rain' and 'rain' is called 'dust' , then where do fish live ?