### Theory:

Adding suffixes to words means adding letters at the end of words to form new words. If we add letters like "r", "er", "or" at the end of some words, we get the name of the person doing the activity.
Example:

1. Use $$+$$ r $$=$$ User (One who uses is called user)

2. Teach $$+$$ er $$=$$ Teacher (One who teaches is called teacher)

3. Govern $$+$$ or $$=$$ Governor (One who governs is called governor)

List of words formed by using "r", "er", "or":

 No. Word + r / er /or New word 1 Bake r Baker 2 Write r Writer 3 Drive r Driver 4 Subscribe r Subscriber 5 Vote r Voter 6 Use r User 7 Buy er Buyer 8 Watch er Watcher 9 Foreign er Foreigner 10 Prison er Prisoner 11 Teach er Teacher 12 Farm er Farmer 13 Sail or Sailor 14 Operate or Operator 15 Act or Actor 16 Govern or Governor 17 Supervise or Supervisor 18 Direct or Director