Coding Decoding Letter Shift Mock Tests

If each letter is shifted by +2, how will VEGETABLE is written?

If each letter is shifted by +1, how is RETAIL is coded?

If DOG is coded as FQI, how is CAT is coded?

If "cat" is written as "ecv", how will "dog" be written?

If PENCIL is coded as RGPENK, how will PAPER be coded?

If each letter is shifted by +1, how is BOOK is coded?

If in a code each letter is shifted by -1, how will SUNSHINE be written?

In a certain language, FRUIT is written as GSVJU. How is JUICE is written?