1. 規則動詞過去式變化
   1. 直接加ed
   2. 字尾有e ，只加d
   3. 重覆字尾加ed
   4. 字尾是子音加y，去y加ied
2. 不規則動詞過去式
3. made the beds
   1. 20 students
4. cleaned bedrooms
   1. 20 students
5. wiped the doors and windows
   1. in the living room
   2. 15
6. mopped the floor
   1. in the dining room
   2. 12
7. cleaned the bathroom
   1. 10
8. swept the yard
   1. 3
9. ironed uniforms
   1. 2