1: clean..........
--> cleaned
2:return.........
--> returned
3:stop.............
--> stopped
4:stay..............
--> stayed
5:walk..........
--> walked
6:shop...........
--> shopped.
7:look.........
--> looked
8:tidy...........
--> tidied
9:smile................
--> smiled
10:cry..........
--> cried
11:water...........
--> watered
12:drop...............
--> dropped
13:call.............
--> called