作业精灵老师示例：
1.
S1：What is my father doing？
S2：He is cleaning the car.
S1：What is my mother doing？
S2：She is cooking breakfast.
S1：What is Helen doing？
S2：She is sweeping the floor.
S1：What is Tim doing？
S2：He is sleeping.
S1：What's Mike doing？
S2：He is helping his father.
2.
S1：What is my mother doing？
S2：She is cooking dinner.
S1：What is Helen doing？
S2：She is washing the dishes.
S1：What do Tim and Jim doing？
S2：They are eating fruit in the living
room.
S1：What's Mike doing？
S2：He is cleaning the table.
