Each of the words below can be changed in the same way to make new words. Can you determine what it is?

ALL
MAT
PAST
PLEAS

HINT:
The same three letters, in the same order, will change each word into another.

Answer:

The letters URE can be added to each word to make a new words:

ALLURE
MATURE
PASTURE
PLEASURE 

Credit: James Arthur
              URE MOVE